Make the HPI F10 your last choice. There is a lot you have to do/upgrade from the initial kit in order to make it competitive. I had a buddy buy a F10 and spent just about as much as the kit cost in hop-up parts just to make it competitive with another buddy's box stock F104. The F109 is a good choice. You can also roll with the Tamiya F104 but it will cost you a little more than $150. I heard that Corally is reviving theirs but it will be as pricey as the previous one they offered.