Well then your on the right track for extra stuff, I said at least $500 and if you got $800 in mind your good to go.
A variety of end mills is always good, 2flute for roughing, slotting and whatever, It can handle a better chipload, 4flute make nicer finishes. A rotary table would be nice, you could even use that for angled cuts.
I would have chosen that larger mill myself if I had the cash for one, and if I could carry it down into my basement
Square/dovetail column mills are really nice, they are more rigid I guess from what I hear, They are going to be more expencive and I dont see any that arent gear driven and lower rpm. Theres a nice RF column gear driven mill at mscdirect for $1795-$1895 but Im sure thats out of the question.
1-2hp would be really nice, Im on a 3/4hp motor and its serving me really well, I thought about getting a 2.5hp motor for it for a while but I can stick with what I got, I am working on converting my spindle to belt drive and max RPM of 9000
Jon