Bike Forums - Need a bike.....

When I was younger I used to do a lot of riding, some for commute and other times I would hit the trails....Havent been on my bike for quite a bit and recently wanted to start riding again...After a couple of rides I realize I need a new bike....I know this is a very broad question but Im looking for a decent mountain bike and dont want to spend over $600 or $700....So any sites that have good deals or even ones that just give good reviews would be appreciated.....Also recently saw a "newer" bike company called Navaro and I believe they are only sold through the retail store of REI....Any info would be nice, they currently have a full suspension bike on sale but it seems it might be a "KMart" bike....