Congratulations! Offhand, I'd say leave $50k where it is or stick it in a CD, save $5 in your personal account, spend $3k on something nice for you and/or your loved one, and write a check for the other $2k...then look for an accountant you're willing to make it over to.

The news suggests there may be a 100% tax credit for business equipment purchases shortly, so if you have dreamed of doing something on a larger scale this might be the right time to leverage your gain. Bring a wishlist of a few things you'd like to meetings with an accountant, including some sensible and some wild ideas. Likely s/he will point out options neither of us would ever think of on our own.