Well, I wound up going with the NGKs after all - I figure this will give me a good starting point. If I don't like the NGK's I'll probably swap over to the Autolites.

I just want to thank everyone for their input - it saved me from both wasting money and wasting time! Had I just gone ahead and performed the tune up, I probably would have gone with the Bosch +2 or +4s - and after hearing from everyone, I can see that the Bosch plugs might not have been the best choice after all.