Take a look at Brownell's; they sell a couple of prearranged tool sets that might be to your liking.
IMHO, for a good basic kit, you'll need the following:
HAND TOOLS:
One set of good needle files (Swiss pattern)
One medium sized set of Swiss pattern files
Mill files (bastard cut) in round, half round, and flat configurations;
File card
Chalk (for the files)
One good set of stones, 6x1/2x1/2 (one India stone, hard arkansas or ceramic stones)
One good set, drift punches
One good set, pin punches
Bench block
Non-marking brass punches
Rawhide mallet/hammer
Plastic and rubber faced hammer
8 oz. ball pein hammer
One good set, hollow-ground screwdrivers (recommend Brownell's magna-tip sets)
Two sets allen wrenches, metric and SAE
Nut drivers, metric and SAE
Socket set, 1/4 drive, standard and metric
BENCH TOOLS:
Vise. Don't scrimp--get a good one, adjustable in as many ways as you can get.
Pads for the vise jaws
Bench grinder, with medium and fine stones
Drill press (bench model OK)
3/8 inch, VSR drill
One good bench light, flexible, with magnifier
Machinist's rule
Dial or electric caliper
Snap caps for every caliber you own
A really good cleaning kit
Light and heavy oils, penetrating oil and Lubriplate grease
Shop rags
Visor for eye protection
Apron
Rubber gloves
If you want, a Dremel or Foredom tool can do wonders--but be careful! The use of either one can be a great aid and time saver--or it can get you into hot water REAL fast. More guns have been ruined by Dremel and Foredom tools used improperly than almost any other source.
MOST IMPORTANTLY:
A GOOD set of reference books and publications.
I recommend highly the excellent Shop Manual series by Kuhnhausen; worth their weight in gold.
Also, you'll want the NRA book of exploded gun drawings.
Finally, for a good home study reference, take a look into the AGI Gunsmithing videotapes; also, the reference material offered by the School of Modern Gun Repair out of Phoenix, AZ. It's a home study course, and will assist you tremendously. Also, keep good notes of your experiences and findings when doing maintenance in a binder for easy reference.
Good luck, and I hope that you become as obsessed with repairing, cleaning and maintaining guns as I am.