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with low profiles because I thought they looked cool. get more flex in the tyre to absorb bumps, etc. If you're buying the car to drive rather than to pose, I'd recommend it every day. It turned a borderline undriveable MR2 (due to the combination of Tein coilovers and 17" wheels) into firm but fun. - you're pretty limited in availability these days on decent brands - that said I sourced Toyo T1Rs after some searching which I found to be excellent, and I noticed shortly after having them fitted that they became more widely available again.(Testing my patience)(Competent but dull) I think I'll get some wheels, probably these: I wish I could have a sensible tyre wall height and fill the gap nicely. Although a sensible amount of travel is as important to driveability as the right tyres. Even when i put some 15"on while i refurbed my 16" i could tell the difference.(ideally) and it is much tighter and firmer than a regular one, so you'll still feel the harshness after a while if you run 15" and as for handling on 17s, well your on UK roads and not a race track as long as you have a decent tyrewall ratio you should be able to feel the feedback from the road progressively enough to respond to be safe and driveable. 
3VZ-FE V6 TRD Widebody Replica"TRD dude. TRD... Can see awesomness from anywhere. " Poor quality and / or overly stiff springs plus poorly match / valved dampers (TBH most aftermarket kits are) will ruin ride quality and suspension performance as much as a change to lower profile tyres. / 16" wheels, which again compromised damper performance. If you get a set of proper lightweight 17" wheels, and stay sensible with the profiles (45 is optimum, 40 is the limit, 35 is just too low IMO) then there's no reason they cannot perform just as well as a 15" wheel (given similar overall circumference). ~300bhp / 300 lb/ft then a wider rear tyre is beneficial for traction in most circumstances, and unfortunately many 16" wheels can only take up to a 245-section tyre (from a limited number of manufacturers). Depends what you using the car for.(215/45/16 or 225/45/16) and a 17" rear (255/40/17) which I think will provide a good balance between grip, compliance and unsprung weight.- OZ superleggera, tyres are widely available and they are a decent lightweight wheel (not as light as the others i had) and i can run a big brake kit too.(UK na car) with proxes on the back (std wheel size) and i have to say it felt awful, at the profile you get with the 15's the side wall is way too soft for my liking... suspension for handling and looks or wheel size for just looks (OK then tyre choice too) but both at the expensive of comfort. If you modify both comfort escapes that much more quickly. Although on 15's they're still aftermarket wheels (for the look) but the looks side is mainly catered for by the low ride height and old fashioned styling extensions (colour coding detailing on the bodywork and the spoiler, plate holder and aerial deleted amongst other tweeks). To the OP... you've answered your own question. Enhance what you bought the car for and stay 15. If you must change go no larger than 16s and stay staggered if you can. Lightest you can afford. Other than that you're looking at bargain budget mid range passenger car tyres which I wouldnt put on an MR2 Also there are more tyre choices in a 16 than a 15 Perfect wheel/tyre combo IMO 