I am totally happy with my busman mod ua5. If I were looking for a UA-5 I would consider sending him a PM. The Oade ua-5's are great too, but IMHO I like the BM2P+ UA5 better than the straight d-mod oade. The Oade T+W+P+ or any of those without the + are all top shelf but generally more expensive than the busman one. You should listen to some archive shows as suggested before to decide what you need/want.
FWIW I spent around $1200, but that includes the JB3, SVU-1,($65) Kind Kables,($65) Mountain Smith camera case, ($80) pelican case w/foam for mics ($25) universal dvd batt, Good DPA windscreens ($30)Todd R juice box, Optical cable, bunch of other cables, AKG 391's with mounts thin windscreens and t-bar, Bogen 3076 stand, Busman Ua5, I think thats about it.
The omni caps for the akg 390 series will pretty much have to be bought new. I have seen 1 pair go up for sale here ever. There may have been more, but thats all Im aware of. A lot of people have been talking about getting the omni caps from Boxymusic. So the 390 series might not work for you.
I would consider spending a little more right out of the gate to try to hold off the urge to upgrade, and dont forget about the accessories, that $$ racks up pretty quick.