trex 450s is kit heli with alum and plastic frame, plastic head/tail.
trex 450sa is prebuilt heli alum and plastic frame, plastic head/tail.
trex 450se is kit heli with alum head/tail carbon frame.
trex 450se v2 is the latest kit design with alum head/tail carbon frame.
mini titan is a good choice 450 size heli with plastic head/tail/frame.
mini titan SE is new kit with plastic frame and alum head/tail.
honey bee king will be the cheapest out of all of the above but you might outgrow it fast. if you decide to get a trex or mini titan, you will also need a radio, 3 cyclic servos, 1 tail servo, gyro, 3S lipo, lipo charger/balancer. most heli kits come with motor and speed control.