A few ideas...
Do you have monitors? If not, they're a great investment - I went back and remixed some of my earlier stuff which was mixed on home stereo speakers - man, what a difference! I have
yorkville YSM1-p's (powered), or you can get passives and an amp, should run to about $400 either way.
Mics - Try them out! If it's for your vocals only, then your best bet is to try as many as possible and see what sounds best. I use a Studio Projects C1 ($229) for vocals (and love it) (reedyish pop-rock vocals though, not rap/R&B-like at all!) but my dealer let me take it home to try it in my setup (after taking my credit card number down of course). Try as many as you can and see what suits you. If this is not an option, then you are stuck with the advice you get here, which is OK, but not optimal...
If you are recording a bunch of different vocalists, then you may need a couple (or more) of different mics. Maybe something quite neutral like a Studio Projects B1 and more coloured like a Rode NTK or a Marshall MXLv67. A dynamic mic like an SM7/EV RE20/Sennheiser MD421 or 441 might also be useful.
Compressor - I have a behringer composer pro, which many people say sounds better than the alesis 3630 (its features are similar, and it sounds fine - but I haven't used a 3630), but I recently got an RNC - you need to get the RNC! The behringer has the versatility of being able to be used as 2 independent mono comps, but sound-wise, the RNC kicks the behringer out of the park!!!
Mike pre's - I have only really used the crap in
my ROland VS840 and my mackie mixer, so I don't have a lot of first-hand experience. Art have a bit of a poor rep here, but I've heard some good stuff done through them. But a tube MP is not going to be as versatile as the focusrite stuff (good not great pre's if you're looking at the platinum series). The Studio Projects VTB-1 is on my shopping list for a dedicated mic pre - $129, single channel solid state with option to add in tubey sound via a blend knob - versatile, and should make a great combo with my RNC.
So I guess my overall recommendation is:
Yorkville monitors + alesis/samson amp around $400
RNC $179
Studio Projects VTB-1 pre $129
That leaves $292 for mics...
Studio Projects C1 ($229) + B1 ($79) =$308
SP C1 + SM57 ($79) =$308
SP B1 + MXLV67 ($99) +sm57 =$257 (3 mics - clean, coloured and dynamic)
SP B3 ($169)(multipattern, omni good for group BV's) + SM57(or V67)
NTK = $400 (a bit of a stretch, but hey, if it works, it's worth it)
MXLV69ME $279
Audio Technica 4040 $299
Shure SM7 $299
The list could be endless. One note of caution, Rode NT1's ( I have one) can work for some voices, but be sure they work on yours before you buy - mine sees virtually no use now since the C1 came on the scene, and they tend to have a hyped top end)
Loads of options, and the opinions out there will be hugely varied. If I was just recording me, I'd take the C1 and 57 combo, I love both of them on my voice (which I don't really like!). For recording other people, I'd probably go for the B1/V67/SM57 combo for variety. If you might be recording instruments as well as vocals, you might want to add in a marshall MXL603 $70 as an alternate for your C1000 too.
If you have monitors, that changes things a bit - NTK and SM7? RNP? Lots of options
Good luck,
Steve