Jim,
If you have to be addicted to something, you couldn't pick a better "drug."
Here's a few thoughts about selling your #2 set:
1) If you sell as a complete set, you'll lose some buyers due to the mixed condition of the raw cards. If I were buying a complete set, I wouldn't mind some upgrading, but if it got to more than 30%, it would become a consideration.
2) I had a complete duplicate 1960 PSA set that was all in PSA 7. I chose to sell it myself on eBay as a set break (572 separate auctions), and when the smoke cleared and fees had been paid, it turned out to be about a wash compared to what a complete PSA 7 would have sold. If I had it to do over, I'd probably consign it to a catalog auctioneer (the buyer's premiums are better now).
3) I think you'd do well selling the PSA cards individually. The cards don't come up much in PSA 5-6, but when they do, the prices (at least on eBay) seem predictable. The Buy-Sell-Trade section here would be fine.
Good luck with your pursuit!
Bob