The Autolights seem to help out with KR more then NGKs but the NGKs will last longer. I dont mind changing my plugs and change them a few times a year so it isn't a problem with me. The Autolights are cheaper then NGKs so it evens out in the end. So if you don't mind changing your plugs I'd go with Autolights, if you just want to install them and forget about them - NGKs. As far as heat range I wouldn't bother with a heat range colder plug unless your N/A. That is what Intense, ZZP, and WBS recommend also.
1992 Bonneville SSEi: 13'* on the way!!
New PB: Good enough for people to call BS on it! Still with stock pulley!
15.009 @ 88.96 MPH - 2.18 60'(bone stock other then 4" intake)