Despite having appalling battery life due to one bad AAA cell I love my OMP. Still though, a 2100 would be great just for the massive amount of things it can do that the OMP cannot. At the moment I often am using my OMP when I don't have it's batteries in a charger.

Just so you know, getting Nickel Cadmium batteries and a real Newton power adapter is totally worth it. I do not recommend not having a Newt adapter and Nickel Metal Hydride cells as they are a pita to keep removing for charging. On a side note, IIRC you should not even charge Nickel Metal Hydride cells in an OMP anyway so be sure to get Nickel Cadmium cells.

In the end though if you can get your hands on both the OMP and 2100 then go for it.