I really am quite a fan of the Sapphire HD 3870 Ultimate; the design of the cooling is excellent and hopefully they do something similar come launch of the 4K series of cards from AMD.
The HD 3870 is still a very capable card, and with the popularity of the Intel chipset Crossfire is a more likely dual GPU setup then SLI. You do have to feel a bit sorry for Sapphire; with AMD being so slow in the market at the moment, a company like Sapphire who makes some excellent products hasn't really been able to shine. Fingers crossed that this all changes when the 4K series of cards start appearing later this month.
The only real problem with the Sapphire HD 3870 Ultimate; it's kind of funny because it doesn't really seem to show up much in the retail channel. The chances are that Sapphire got a bit bored waiting for new models to come out so they decided to do something different with the current line-up.
The HD 3870 continues to be a great card, but it's probably something worth picking up second hand these days instead of being a brand new purchase. If you could hunt down the Ultimate version from Sapphire, we would say go for it. Silent performance is always a great feature.