That would have my requirements for a good replacement (simultaneous dual-band N). I don't see it mentioned specifically on the TomatoUSB site. They mention the E2000, but given how specific these things usually are, are you certain it applies to the E2500 as well?

I'm still waiting, though, for a router that has such a reliable and easy upgrade path as the WRT54GL. The process for flashing Tomato on that thing is practically 1 step.