I am a begginer teaching myself to fly helicopters. Ive been looking into the T-rex 450 and have come across the T-rex 600. I was just wondering if the larger size of the 600 would be easier for a begginer? But if I go for the 450 should I go for the 450XL HDE(mechanical mixing), 450XL CDE(ccpm mixing) or the 450SE?