You asked, "I am looking for a great running shoe that goes from pavement to trail with ease. I was hoping to spend around $100. Any ideas?"
It sounds like you need a supportive shoe that is not too heavy but that is also durable enough to handle a few bumps along your run. Adrenaline ASR 4 ($95.00) from Brooks Running may be just what you need. It looks more like a running shoe (not as bulky as a typical trail shoe), but could hold its own on a smoother trail (more supportive than a street shoe). It features a higher durability, abrasion-resistant rubber outsole built to last, and the softshell is made to repel water and transfer moisture, so soggy surfaces (trail or pavement) won't slow you down. What's more? It's $95, just five dollars under your budget. Buy it directly from BrooksRunning.com.