I love my RMHD. For the same reasons you want one. Battery/usage freedom. Not being afraid of what I can and can't do before killing the battery.
That said, Motorola is rumored to be releasing an X phone in May/June timeframe, which people expect to have the same superb battery Motorola is known for lately. Personally, I'd wait for that one. Since you said you don't want to wait for 3+ months, maybe buy a used Maxx HD to hold you over until that phone's release?
If you're set on the Maxx HD, though, you can't go wrong. Is it the latest and greatest? No, but then neither is the S3 (8+ months old now). It has a pretty decent screen, UI is light and near stock, and this baby flies. You'll get the occational redraw, but I don't mind it so much. But all this said, you will get what you are looking for in battery freedom.
Good luck on your decision!