Consider the Sanwa MT-S too, the 'compatible' receivers are available from $25-30. If you want reliability, compatibility and speed they are good choice. If you ever need to borrow a receiver or transmitter it is likely going to be easy to find one at any race.

The noble feels solid and is great value in terms of features, but it too had some receiver problems early on. If you run into problems on race day you're likely out of luck unless you know someone else running it.