Is there such a thing? It looks like you can use the Seido dock in vertical mode even though the fine print says this could damage the charging port. Are there any with a built in charging port?
ProClip's Droid mounts can rotate and there are options for power. They're not cheap but I've always used them in my cars and highly recommend them.
ProClip Mounting System - Device Holders
You do need a vehicle mount in addition to the device mount. I'd suggest checking out Panavise's brackets instead of ProClip's vehicle mounts.
None of the Car Docks that I am aware of come with a built-in charger. The Car Dock Motorola makes is amazing imo, you could just... tilt it.
motorola car dock ftw..dunno why ppl buy from other brands when this is specifically made for our droids. Well if you use a case then you are out of luck with the motorola car dock.
Doesn't have a built-in charger though.
Another reason for not going with Motorola's car dock: I didn't want a windshield mount.
Motorola's docks aren't the only ones specifically made for the Droid.