The Core rc radio is more than capable of doing the job, but lots of people have had issue's of interferance with them, including my son. There are probably lots of people that have had no issues and are very happy with them.
Reventon Pros a good buy, top spec and not a fortune. 10.5 will be fine and once you are used to it, a bit of timing and boost can be added via the speedo.
Nano Tech Lipo's again very good for the money. For a similar budget you can get Gens Ace saddle packs which are BRCA approved, incase you fancy doing any Regionals.
Never a bad word said about Futaba.
40MHz now days is not such a bad thing to be on as alot of people have jumped to 2.4GHz, so not alot of crystal clashes. There are alot of 40MHZ radios available 2nd hand, and most can be converted at a later date to 2.4GHz by one way or another.
Edit-Sorry repeated alot of what badger5 said.
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