The Garmin 276/376 units are nice. I saw the latter one with the weather radar recently and it's pretty cool.
I'm however, avoiding these dedicated nav units since they don't make a lot of sense to me financially. These are ~850-900. I'm already planning to mount a UMPC tablet PC. I'll probably put about $1200 into one of these and have a general purpose computer at my disposal that I want to use for media, web access when on the go, picture storage and navigation. I figure if I put another $300-500 into GPS receiver+antenna and good mapping software, I've got a lot more feature for the money. Sure I won't beable to get the XM-fed radar, but that's not a dealbreaker for me.
BTW, damn you H2 Rocks (and Mike Morris too) for awakening my gadget bug and convincing me I need to do this GPS/mapping thing
