I would deff say get this one. Im going to get it next week i had a treo 700p before this i liked having a back up battery on stand bye
LCD Desk-Top Cradle Chager ( With Battery Charger Funtion )
1) That site has a bad WOT (Web of Trust) rating. You might want to shop elsewhere.
2) The dock doesn't look like an Eris would fit in it. (I know that site says it will fit, but I've seen pictures of docks that look exactly like that one that, when I checked with the seller, I discovered would not fit the Eris... The phone holder part of the dock was too narrow...)
If anyone has that dock and has tried to use it with an Eris, I'd love to hear about it...