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What are you looking at? 8,10, 12"? F/4 is fast. You'll have to buy a quality if not dedicated field flattener and coma corrector. Above 8" primary mirror mounting becomes interesting. Because of the weight you'll need a good primary cell. Also keep in mind if you use an AO/FW then you're going to need a reinforced tube around the focuser area and also a solid focuser. In a nutshell if you buy "cheap" you'll have to fiddle with it a fair bit to make it work. If you want something that works out the box you'll have to spend some $$$ for it to be mechanically sound. Make sure you have all your measurements/back focus work out before you commit.
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