Does anyone use more than one transmitter?

Many people suggest spending the extra dough on a computerized 6-channel radio, since you'll need it eventually, while other people point out that a basic 4-channel radio will likely get you through at least your first two models.

I was sort of planning to get a basic 4-channel system, but then rather than "upgrading" when I need a better radio, buying fancier radio on a _different channel_ than my trainer radio. I don't plan to gut my trainer for my second plane, which would leave me with two channels to choose between when I hit the flying field. Maybe frequency clash isn't a big issue, but it seems to me that having two frequencies available could be a Good Thing(tm). If my fancy 6-channel freq is taken, I can just take up my 4-channel bird on the other freq.

Is it feasible to have two receivers for each plane and swap them out as appropriate? (obviously if you absolutely have to have 6 channels, then it won't help to have a 4-channel receiver for it)

Anyhow, just some thoughts from a fellow newbie.