1st two things - in my opinion - 20C battery &ES180 motor upgrades. Then I'd go with upgrade blades, aluminumlower head, aluminum upper extended head, aluminum swashplate, flybar weights,&bearing holder. Finally, you could go brushless, sport canopy, tailboom, shortened flybar. We fly the CX2 &love it, it's a good littleheli that can be made great but be careful who you order from, make sure it's a reputable dealer.