haha. but many of them still believe long lasting + good grip comes together....

It's very easy to figure out alternative wheel tyre combinations. The objective is to get the same overall diameter of the pair. For 175/65/14, there are no alternative 14" tire sizes that will give exactly the same overall diameter. The closest is 225/50/14 (-0.4% overall diameter) or 195/60/14 (+0.9%)

If upgrade to 15" rims, can go for 185/55 (nice low profile) or 225/45 (boy racer low profile) both no effect on overall diameter

For fuel economy, they say if your new combi weighs more - then naturally FC will suffer. Hahaha go weigh your stock combi & when you shop for new rim & tires, bring a weighing scale ensure weight no increase

For handling, the boy racer 225/45 might seem better intuitively - but the engineer research says you have to make sure you don't alter the "scrub radius" too much - hahaha go google that - that has to do with the rim offset & the overall geometry of the suspension system. Also the research say wider tires will affect your pickup ie look nice but cannot run 

For cost, of course change rim burn bigger hole in pocket la. Even those 14" combi mentioned, you definitely need to change rim for the 225/50, not sure about the 195/60

Me no genius - use this online tool . Have fun!

seriously 225/50/14 ?!

Wider tyre contact area is the same compare to ori as long as tyre pressure are the same.

Should be negligible difference. The 195/50 is wider hence more traction/rolling resistance in general but the overall diameter is also a bit smaller than the 175/65 so they kinda negate each other, provided both are similar tires. You should use 205/50 though to maintain about the same diameter but the rims should also be wide enough for 205 tires (6-6.5jj wide).

You can check with this conversion calculator:
https://www.wheel-size.com/calc/?wheel1=175...wcl=30mm&sr=0mm

note that bezza suggest use 6 or 6.5jj rim.7j with 195 width tyre will rub fender.