well the first mods are simple, that last one (e153) isnt. be willing to but in some hours or some big bucks to have a speed shop do the work for ya. eibach and H&R springs seem to be the perfered springs with the toks. as far as wheels here this will help u in ur search.
http://www.toyotanation.com/forum/t100252.html
ull have to decide between summer and all season tires, summer are better for grip but do crappy in the rain and snow. u may want to consider saving and waiting for the TRD S/C too. id rather do that than get nitrous even though it would cost ya about a grand for one used, maby more. plus a 125 shot might be a little to much stress on the stock internals. just a thought.