solution:

step 1: use track legal one for the track.

step 2: use some of the money to set up a new commuter (or use one of the other two bikes)

step 3: purchase ****** laptop.

step 4: enjoy your life thoroughly.

4 bikes just seems a little too much, at least in your case, with three fixed gears, assuming theyre all converted road and track frames.

when its all said and done, its your money, but i think you can make do with what you got, maybe buying a few more minor parts and switching some things around. this is, however, an opinion conjured up with absolutely no real knowledge about you or your bikes whatsoever.