Hi Shaul,
 
In the USA check out:
www.onlinetires.com also
www.tirerack.com
 
The ADrive I have bought from Bob Jane tyres.
 
There are others but this is a good start.

If the standard ratio is 3.9 then yes, moving to 3.54 will pick up most of the difference.

175/50/13's on 6" dragways, look like arse @ standard height
 
 
Needs to be low!

 
 
Yeah it's a massively different style over there (look like cotton reels :). But I'm no fan of the 205/60 either. Modest JDM style is where it's at (wide rims, tall tyres ie: 65/70 profile with a little stretch)
 

 
 
 
 

Ive done the 175/50 on a 13x8

 
currently using 175/60 on the 13x8's, similar look but just softer ride and better rolling radius.
 
also done 175/70 on the 8's 
and 175/70 on 7's

I have had both Yokohama 352s and Falken ZIEX ZE912 in 205/60 on a 13x7 rim and in my opinion the Falken are a better tyre. The Yokohamas are softer with treadwear 200 and Falken 360 but the Falkens seem to hold on better, a lot better in the rain also. The Yokohamas didn't last long either.
 
I was going to use the Yokohama A539 185/60 but no tyre shop here in Adelaide said they could get them. They all said they may not be stamped ADR approved so I didn't want to take a gamble. To those using this tyre, has it got any markings on it about meeting Australian standards? If it does I would get them.
 
Last tyre change I decided to try the ZE912 in a 185/60 on the front and although they are harder than the 205 they still give a fair bit of grip. Still not as good as the 205 though.
The bloke at the tyre shop said there isn't any other 13 inch road tyre (185 or 205) that would be as good so that's why I keep buying them.
 
Ryan

I've always gone to Bob Janes at Prospect. They have always looked after me and they really know what they are talking about.
 
If look is an issue I can chuck some photos up of the Falkens and Yokohama 352s (althought I don't think you can get the 352s at the moment) so you can see both sizes with respect to guards and what not. You might see my car at the Yankalilla cruise Sunday anyway.
 
Ryan