This is what I would do:
The posts above have many good pointers, I reccomend someone trying a 30 size because kits are really advanced now more than ever and offer a lot for the money. The 30 sized heli are cheaper to maintain lets says on parts prices as a crash kit inexpensive. Plus on a 30 sized heli fuel cost is a good bit more affordable than lets say a 60 sized heli.

Some of the 46 sized helis are nice too, but I reccomend a 50 as the OS 46 carbs were a bit touchy on the needle settings moreso than the new OS 50. As far as power the OS 50 has lots more power and a better carb than the 46 OS. MPG LoL, is defitnetly less than the 30 sized engines..
30 Sized Heli's available in Kit Form: (popular)
Caliber 30
Hirobo Shuttle -Even though the Challenger doesn't have auto rotation set-up can be upgraded
Shuttle ZXX -Good Solid Heli-W/lots of upgrades
Shuttle TS -Good Kit w/Top Start-For me a must-I didn't like belt starts
Shuttle Plus -I have seen this kit online for $179.99 Very affordable
Nexus -OK but I like Caliber Much Better
Raptor Good Sound heli 30 or 50 size-I saw 29BB On sale w/bb upgrade very reasonable
Sceadu 30
Venture-30
Quick 30-Learner-Pro Version
Just a few to consider