Congrats on getting the head removed and sorry about the damage to the piston although it could have been MUCH worse. (I am sure at least one member on the list has thrown a connecting rod through the block!!)
Obviously your call on what you want to do next based on budget, schedule and plans for the car.
COuple of thoughts:
1. MOST IMPORTANT thing is to get a handle on is why it blew up in the first place. If you don't know it could happen again.
2. If the damage is not too severe on the cylinder liner, you can resurface the cylinder and replace the piston/rings without pulling the engine out of the car. (as per earlier link that I posted)
Perfectly legit repair and it won't break the bank. (You are also at about the 70% mark if you take this route but only at the 25% mark if you are doing a complete rebuild.)
Also, if you repair the piston now, you get your wheels back and can re-build at your leasure. (As long as you use liberal mounts of anti-seize on the exhaut manifold bolts, they will be MUCH easier to take off the next time.)
Again, congrats on being gutsy enough to tackle the job.
Clint