Hey Sam,
I've been flying my SE for 1 1/2 yrs so far, It rocks
The trex is a great machine just stock.
What gyro do you have?
What servos?
What blades?
The more you practice, the better the flying is, which makes the trex seem better still.
If you have the SA version parts are cheaper...
If you have the SE version parts last longer...
Learning to fly a heli takes quite a while, and a lot of parts, ($$$)
What are you looking to make better?