I'm not a fan of anything 2ga unless its all 2ga. Whatever you're taste is, do what you think looks good. If you have it all, put it on for a week and see if you like it. I have a '99 so I got the 2gb stock bumpers, but decided on an Eagle Talong TSi side skirt set (twisty's).
Personally, since you have all 2gb, except rear bumper, find a 2gb rear and keep it all the same.
1999 Eclipse RS