I'm not sure if you're looking for mapping features, but if the eMap is on sale too, get it! You'll love it. I ended up getting the eMap instead of the eTrek when cmv made the first (dsport post) about it. The on board map is detailed down to the major city street level. It also has a window that tells you up coming off ramps as you're driving along the freeways (express ways for you east coasters). If you get the MetroGuide and Serial cable, then you can get some very cool features like more details, Gas stations etc.. etc.. with it.
If you can find the numerous threads cmv and I had on gps in the Hot Deals forum, I have links to DIY cheap cables and a link to make a 8Meg memory cart up to 128M.
Or go with the eMap Deluxe package, and get the 8M cart, MetroGuide and serial cable.