btw, i m a protoss player and hv difficulty in facing zerg Roach rush and camp in front of my base to limit my expo....their tactics mostly are roach rush/hydralisk then mutalisk to harass...in which my stalker and Colloseaus will be much more useless to stop them..any comment on this?

depending on the containment situation, colossus may not be advisable due to them being a huge "hit me target".
hydras and mutas will be able to take it out easily

not to mention, colossus takes a whole lot of time, zerg roaches/hydras dont. need robotics + bay, then to even ultilize the range upgrade (force field you mentioned) you need to well, have it upgraded

HT's or even DT's if the zerg isnt careful enough to get overseers would do a MUCH better job at warding that containment, and proceed to counterattack. not to mention, if you go DT, it would cause an upset for the zerg to 1) get seers 2) evo chamb > spore which would ultimately slow down his replenishment too from the counterattack.

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Added on August 6, 2010, 4:47 pm

you need chargelots, zealots are useless.

that said, they DIE FOR A PURPOSE. they are your meatshield. would you rather have your colossus/stalkers melt away without zealots or force field warding off a roach army? unless ur micro is damn good and zerg isnt focus firing (typical roach player wont as FF'ing roach tend to produce a LOT of overkills, that said, he could multi group roach but thats damn advance micro'ing ady and is only seen amongst diamond league players and rarely [almost never] plat or under) then you can go pure stalker/colossus

in a way, pure stalker would be better than colossus as they are cheaper, and easier to pump out. thus you're getting more firepower in short term (you got rushed and contained, lets not even go long term) but yeah, overall colossus do provide a much higher long term firepower compared to  just stalkers.

Aussie diamonds like to talk lots of cock man. Worst still is they are diamonds in all 4 leagues and have an APM of..30..even the APM spikes are like..80~100.

I think these are the people who cheese their way to diamond.

either: -
1. 3.5 range
2. 100/75 (75/25 is hax)
3. remove their 1 armor