i thought 18's would b a bit much! im lookin at 17's the now not too bad prices either think multi spoke alloys look great on a roadster
18" will fit if you can find the tyres which are going to be like rubberbands if they exist.
Even if you can get them the ride is going to be painful, the stock dampers are set up to cope with tyres that have more give.
you'll also struggle to get a width narrow enough to not foul the arches. I won't even mention the weight of them :-) :-) :-)
I agree with you that multispoke tend to look the best on a roadster.
something like the TTE wheels (though they are heavy) or the speedline 2120 would be your best bet.
you got any pix of they alloys?
what prices are they startin at?
can i get them through toyota?