just looking to by a high powerd ep, for about $100 or under. i have a 8'' skywatcher goto dob 1200mm f/6. im after an ep i can use alot or most of the time, not just when theres perfect seeing, so what type of power? 4mm 300x would i need excellant seeing for 300x(would i use it much or would the seeing never really be good enough?) or should i go more 6mm 200x?