Nothing wrong with PP, it's a fine oil.
Any SN oil will last you the full OCI suggested by your car's OLM. GM didn't start requiring dexos until 2011; however, it is backwards-compatible with the older cars.
For OLM cars, I like to use the cheapest synthetic on sale and run it for the OLM. Napa often has their house brand synthetic for $3-4/qt. Napa Synthetic is rebranded Synpower.
However, even Smitty's at Kmart will be just fine. It's 10% PAO, and on sale for $1.99/qt
My filter choice would be Wix/Napa Gold, Fram Ultra, or the Fram-made CQ filters on Rock Auto clearance (AAP recently switched to Purolator, so that's their new store stock). Of course, if Napa Platinum is on sale, that's a good filter too!
