Depends on what you're using.
ECS has the OEM oil w/ filter kits.
Several places have the Motul Specific: Amazon.com, ECSTuning.com, GoAPR.com
Locally you can find:
Mobil-1 4w-40
Shell Rotella T-6
Royal Purple 5w-40
Really just depends on what you want to use. Personally, I like to use stuff I can get locally, and I used T-6 in the GTI, and I use the T-5 10w-30 in my Dakota, it's a great oil. I also use Mobil-1 Synthetic High Mileage in the Miata and Corolla, extra Zinc and additive pack for great protection. I did an oil analysis on the Mobil-1 in the Miata, after a track day and three auto-crosses, 5,000 mi OCI, they said it still had plenty of life left in it.