I have the GE one too. Inspite of using alkaline batteries, the date seems to fall back by 5 mins every month. :S
Lcd is not backlit though which is a con if phone rings during powercut or at night.
Get the one with lcd backlight. The M60 i think. Has everything required. Cant say about the voice clarity though. Check adexmart for the same models you saw on ebay. If available there, the prices are lesser by around 200-300 bucks.
Just checked. It has M71 for 925 bucks. rest of other models are above 1k.