I purchased an Outcast Fat Cat last summer and love it. It has more foam in the seat and back cushion than a life vest so it's very safe. The bladder is very thick and seems like it will last. This tube sits up high and you feel like your're fishing from a lazy boy recliner.
Do a search and you'll find it's top rated.
They're selling on ebay for abour $210 with free shipping. They retail for $300
The Outcast Fish Cat 4 is also a good one, just has a little smaller tubes.
It's only about $140.