There are tax implications involved in taking cash out and they can hurt quite a bit. The tax man is not nice to traders.
Keep it in there, sell losses at the end of the year, use that cash to fund whatever you want.
I don't pretend to understand US tax law but surely the taxman doesn't care whether your cash is in or out of a particular account? I can see why an investor wouldn't want to withdraw mark to market profits as this would mean selling early and realising a capital gain, but I don't see why a trader would get taxed for withdrawing profits already realised as cash?
GAT