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!