Under $100, I would look at the Safety 1st Guide 65.
I have a My Size 70 right now, and I do like it. I bought it for around $150 through albeebaby.com (well my original seat was the Size 4 Me, the My Size is only at BRU), and while I did have some issues with it in the beginning, Graco has been pretty helpful. I would recommend it for sure. My DS is just shy of 2.5 years old. He is about 32lbs and maybe 36" tall or so. He has tons of room rear-facing still, and it will definitely get him to booster age. I wish that this seat had been out years ago.