The stock ones for now. If you bought that RS, it has 15" wheels, here is another member's 17s with Brembos and they fill that gap:
http://i989.photobucket.com/albums/af18/accox3/photo-80.jpg

You also need to convert your rears to stock disc brakes to prepare them for bigger brakes as it should have drums right now. The junkyard can supply donor brakes from a GT for a good price which gets you the parts you'll need when you do upgrade to bigger brakes. And look into bigger wheels. I hate how small those RS 15s are personally, it leaves a big gap in the wheel well, and I don't know if big brakes will fit.

 

2000 Model saw dual piston front calipers, 01+ were single. The pads on the dual piston were a bit larger as well. Also, yeah, switch to gt rear brakes.

 

So would I be okay with 16" rims or do I need to get 17"?

and I just need stock gt/gts disc brakes?

 

For the rear you can pull directly from a GT/S and it will bolt on with very little work.
This gives you the mounting hardware for a future upgrade to something more expensive.

The stuff you take from the junker are: Backing Plate, Caliper, maybe the Piston, Bolts.
The stuff you buy new: Hoses, pads, slides, seals, boots, rotors.

 

Completely self-serving, but I still have my dual piston fronts and the rear calipers off my 2000 Eclipse and I am "somewhat"more local which might help with shipping or if you ever make it down to the coast...

 

You'll just need the 16" or 17" stock wheels or aftermarket wheels and the parts from a GT or GTS for the conversion. I have 17" stockers if you want them.

 

RS 15" wheels would probably clear dual piston fronts, the rotor is the same diameter, just with a slightly different caliper/bracketry. GS 16"s clear them with space to spare.

 

I think what I'm gonna do is start off by getting the rear disc brakes, then later on I will upgrade to bigger rims prob 16" aftermarkets and then after that Ill get brembos or something like that.

 

You'll need at least 17's to clear brembos.

 

I thought you needed 18 minimum? :dunno:

That's all I was told when I was upgrading.

 

18 is the safest bet but it really ends up coming down to backspacing and wheel design, I would bet 95% of 17" wheels wouldn't work. OP, IMO the 4cyl doesn't make enough power to warrant the extra weight, unless you plan on boosting or tracking. I autocrossed my 3g for about 2 years and the dual pistons are plenty to lock up the brakes without being too touchy.

 

18 is the safest bet but it really ends up coming down to backspacing and wheel design, I would bet 95% of 17" wheels wouldn't work.

Tip and trick for anyone, if you want to know which 17" wheels will clear Brembos see if they fit a 2005+ EVO. For me personally while I like the look of 18"s on the 3G, I decided to go back and have been happy with the performance I get out of 17"s on the car.

 

I agree, I loved how my 18's looked (and still do) but 17's are so much better in every other way.