(Sorry for the bump)
If you haven't got one yet, another option nobody mentioned is the Sharp Twin Famicom -OR- the Sharp Twin Turbo.
Basically they're Famicom + Famicom Disk System built into one machine by Sharp (under license by Nintendo) and include both AV and RF out natively. The Turbo model also has turbo fire on its built-in controller.
If you don't care about the FDS games, then the AV Famicom is a fine option, too, although it comes with its own unique advantages/disadvantages. Namely:
It has NES controller plugs and can hence use any regular NES controller (where as all previous models have hard-wired controllers built in). It also has the Famicom peripheral port (on the side) for third party Famicom controllers and peripherals.
NES peripherals (light gun, power pad, power glove, 4 score/satellite, etc.... Anything that doesn't act as a standard controller) will NOT work with Famicom games, because their Japanese equivalents plug in through that side port. Some minor modding to the AV Famicom (connecting some existing solder points) will enable you to use stuff like the US Zapper with NES games played through a pin converter (if you feel like it).
The biggest theoretical downside to the AV Famicom is the lack of microphone (normally found on controller 2), but there's only like a dozen games that use that.
