You want my recommendation? One word: Winslow.
Not cheap, but you get what you pay for.
Consider carefully whether you really need one. A 406 EPIRB, especially one with an integral GPS, is WAY more important unless there is a thermal issue in the waters you are operating in. BTW, "thermal issue" means temperatures under 80F - above that hypothermia isn't the issue for the length of time it takes for an EPIRB to get someone to you, assuming you have PFDs on.
IF you boat in waters where there is a thermal issue you need BOTH a raft AND, depending on the water temps, you may need exposure suits. For water temps under 70F you want BOTH on board. The raft is worth a big fat zero if you can't get into it because you are too hypothemic to climb in.
Also consider that a dink makes a dandy raft for short periods of time if the reason you go down is not hideous sea conditions (e.g. you burn or there's a mechanical issue with the boat that sinks you.) If you are out when you shouldn't be and go down, then a dink doesn't do you much good (its better than nothing, but not by much!)
In short, give careful thought to WHY you need a raft. If you really DO need one, then you're buying true survival gear - you can buy cheap or you can buy good, but if you really need it, cheap is going to look awful stupid as the boat slips under the waves.