im buying a skywatcher 190 mn pro mak newt and an neq6 mount for deep sky imaging with my eos450 dslr, i also want to get a televue powermate and t ring to image planets aswell but im not sure which one is best, and as there a bit expensive i dont want to buy one that to powerfull or one thats not powerful enough. has anyone out there got any advise they can offer, i would be most gratefull