Any tips on what Rims i should be looking for...they are 17x8 Rim size

 

all depends on what you are looking for.. personally I would go with 18/9 and 18/10-10.5 in the back

 

19s look perfect on S197's. Not too big, not too small.

 

Do you mean size or what rims specifically?

 

Both!!! Rim size i'll probably go 19's...but actual rims i'm still looking for

 

Well, the style is really up to you. You should get what you want and not what someone else says you should get...

I've always been a fan of the bullitt style wheels because they are classic and clean, and I've always been a fan of 5-spokes. They look good on any body style mustang, and are priced relatively cheaply.

As for the size, I have only seen 18's and 20's, not 19's, so I don't know what kind of wheels they make 19's in.

Look through AM, look at other people's rides, and decide what you like best.
http://www.americanmuscle.com/2005wheels.html