stock wheels suck. they weigh 25 lbs. and are very prone to damage. you may
wish to replace both wheels and tires as a set. tire rack and discount tire
are good places to start. a 17"X8" wheel with +35 offset is about perfect. a
225 fits all day and a 235 will fit if you care to roll the rear fender lip
up. i am on 235/45/17 with a 17x8 +35 wheel and life is great. are you
looking for all-season?  all-season tires suck pretty much all the time but
will get you by.  a decent set of summer tires with snows on 16" steel
wheels works great, if you can deal with the expense.  are you on the stock
size fittment? 205/55/16 isn't it? tire rack has khumo at a good price:

http://www.tirerack.com/tires/tires.jsp?tireMake=Kumho&tireModel=Ecsta+MX&vehicl
eSearch=true&partnum=055WR6EMX&fromCompare1=yes

the GS-T has a speed limiter in it's ecu that the GSX does not have because
the o.e.m. tire is so crummy....here's your chance to fix that.

I have Tenzo R Rims. All White with polish lip. weigh pratically
nothing. They are 18 x 8. I run Toyo Proxies TSI's (the tires are a
little expensive to some, but I love the way they look, feel, &
handle). They are the same tires used on the track but 100% DOT Legal.
Tire wear is great.

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I use Kuhmo's.

Probably the best you will find for the price