I'm pretty sure there's not such beast as an expedition ultralite. I'm guessing you're talking about the Explorer Ultralite. As it's been mentioned you'll want the longer hammock if you're nearing 6' or more. I bought an expedition for my son and while I can sleep in it fine, it's not nearly as comfortable as my explorer (I'm 6'0").
A friend of mine has the Backpacker Ultralite (same dimensions at the Hyperlite). He seems to sleep fine in it but I think he's only spent a few nights hanging. It's his only hammock so there's not much room for comparison.
Of the HH zippered models I've seen I'd much rather have my 2QZQ mod vs the stock zipper. They use a smaller but very high quality zipper and the stitching and installation looks better than stock. It will cost extra but is just a little lighter (if that's a concern).
Bottom line is the longer the hammock, the more comfortable it will be. If you're going to be hiking then you'll want the lighter weight model. After that, it just comes down to money. Good luck.