I'm guessing that you might be in the States? A shame if so, as there's a guy in N Ireland that makes big oven set-ups with all the required features for quite reasonable money and has supplied one or two to people on here. He advertises on Facebook but can't quite recall his trading name. If going down this route, get as big as you can, as it'll give you more scope on the parts you can produce. You might even find a decent powdercoat oven on popular auction sites and they should work okay if they come with a programme controller. 
I do make some fairly small parts regularly via infusion and whilst it often feels like pre-preg would be less hassle, I can usually get most made in around an hour and ready to de-mould the following day when using a fast hardener.