kindredd owns a speedster s40, you can ask him about  his height and frame size...

i usually don't think it is a good practice to choose frame size based on height...

there are 3 factors that affects a frame..

1) inseam - controls the length between your saddle and fully extended crank arm (6 o'clock position), but seat posts can be adjusted and seat post length is very long nowadays... so, not too important and quite an invalid thing...

2) torso length - controls your handlebar reach, in other words effective top tube length, also can be adjusted with stem but better to get the correct size since lengthening or shortening the stem can affect the handling characteristics of the bike...

3) your flexibility - this is a question only you will know, as the frame geometries can be classified into 2 main ones... race and endurace / comfort / what the guai los call "sportive"...  generally race geometries offer a shorter head tube length and gives you more handlebar drop from your saddle... this requires you to have good flexibility as it will strain your back... endurance geometries usually have a more longer head tube so you site more upright for long distances... each to their own advantage...

so, 1 frame size might work for a 171cm guy but not another 171cm guy as both of you have differences in your anatomy...

nowadays, some people like to adopt the "pro" look which causes them to buy frames slightly or 2 sizes smaller than what they should buy to adopt that look... as they say, never try to imitate... if you can do it, you will do it without problems... else, you suffer for it...

i am confusing you further, ain't i 

seat post height depends on your legs.

here you go: http://www.bikeradar.com/fitness/article/t...ht-right-14608/

easier than me trying to type out how to find the fit and risk messing it all up

For your bike fit, what kinda distances have you been riding your bike so far? Its not something that you'll notice on short distances. Its only when you start riding beyond 30km per session then you may start noticing the issues.

Try to ride for a longer distance and see if your seat bone is aching or feeling like a mild bruising..if it is, then try to lower down your seat post mm by mm to a more comfortable seating. With bike adjustment, the best way is to readjust and readjust until you satisfied 

Hmm.. possible adjustments are the saddle position (forward/backwards and the tilt of the saddle). Handlebar position also can be adjusted to a certain degree if you're using a riser bar.

Stem length, don't think you can just this, but they do sell stems with different lengths.

This is why its important to get fitted properly before getting the bike, cause once you get it, you're mainly stuck with the size that you get.

the article malleus posted is useful... there is no right or wrong about saddle height... but it is possible that you set it too high to the point that your hips start rocking trying to pedal.. then, that is wrong...

about your handlebar reach, it depends if you feel that you are too outstretched when holding your handlebars... if you feel so, (and since you have already bought your bike) you can still see if you can stack your stem higher (first choice since doesn't cost $) to achieve a better seated position... else, you can always swap for a shorter stem...

normally stock stem, people would go longer rather than shorten it as manufacturers will play it safe by spec'ing stem lengths of around 80-90mm which is relatively short for roadies...

how low you can bend while holding the drop bars depends entirely on your flexibility... that itself is very loosely related to your geometry...
if broga is the backyard of my house, i'd go every weekend... unfortunately, it is 30-40KMs just to get there...

just ride first and decide later on the handlebar height ...  if you feel that your back is too strained (which you will in the beginning until you strengthen those core muscles) then, see if you can raise it a bit more.. else, if you feel comfortable as is miaopurr puts it... slam that thing all the way down...
how'd we know? we no prof x you know? you said dreaming mar ... anything goes as long as fetishes is concerned...

you would have used a more direct and suitable words instead to prevent the mis-interpretation... hahaha...

keep this in mind next time, cos we are a dirty bunch 
that is too far adi... over my combined weekly ride quota 

Start off with what you're comfortable with, then work your way up by 5 each time. Try to target eventually between 90-95. Whether to go up higher than that or not will depend a lot from person to person.

You try to maintain the same cadence on all gears, so you pick a gear that you can spin fast easily