Snowman, you have already spent some good money buying nice pieces, it doesn't make since to start cutting corners before your done, especially on some of the more critical areas. You should at least put a fresh bore on your block with new rings. Trying to re-use the old rings just wouldn't even be an acceptable alternative. Is the ARP stuff a requirement....no, more a luxury and added insurance considering your build potential. That would be an area to shave a few dollars off of the budget if you had to. But don't even consider re-using the stock rings at all. Its likely you will get them mixed up and out of order and just create another issue all together, like them not re-seating. If you had just rebuilt the engine and they had just a few miles on them, then sure. Does your block have a ridge at the top of the cylinders? Chances are you have already broken several rings when you knocked the pistons out of the cylinders to start with. Just keep thinking "smart" and don't try to rush it just because you see the light at the end of the tunnel.
