The Sansa Clip has always been well regarded. The new additions to the Clip + is the microSD slot you mentioned which will allow you to add up to 32gb of storage and improved build quality make this one of the best value portable music players out there on the market today. It also plays MP3, WMA, WAV, FLAC, Ogg and Audible. With a MSRP up to $70 it is quite the bargain, I say go for it.
By the way I tested a 8gb Sansa Fuze a few weeks ago and was really impressed with it. It is the model just above the clip.
