Howdy. I'm looking for some advice...

I've been doing push ups and pull ups since Oct. 2005--push ups in sets of 25, and pull ups in sets of 5. I've been adding sets since I started, and right now I'm up to 25 sets of each with about 45-60 seconds rest between each set. I'm proud to say that I haven't missed a single day.

My goal has been to gain some definition in my chest/arms/back muscles. That I've accomplished. However, doing 625 push ups has become almost aerobic, and I don't feel like I'm really doing much at this point except treading water. At this point, I wouldn't mind adding a bit of mass--I'm not looking to get huge, but just a bit bigger.

I've grown a bit tired of doing so many sets, so I got a weight vest. The vest holds the weight right where it should be for what I'm doing--between my shoulders on my chest and back. I haven't used it yet, though--I'm not sure how much weight I should be adding, how many reps I should do in per set, or how many sets I should do.

Anyone have any suggestions?