One nice thing about the aftermarket stuff is that the individual alt's often come with a flowsheet. You can often get more idle amps out of them, which is nice if you keep your idle low (I'm one who likes to burble at 650 RPM). The PA-P units are lifetime warranty IIRC, which is pretty nice (and I have NOT seen a lot of failures from guys on the threads. They just seem to believe in and stand behind their alternators). Here's
their site. Please note that I have not used one of their alternators (they're too expensive for me); I run another brand's 160 amp unit (with ~80 amps at idle). I have some buds whom do run the PA-P units though.
You would probably want to upgrade the power cable for the alternator (this is something everyone should do - stock alternator or aftermarket). It can be done for as little as 10-15 bucks (I used 4 AWG cable and an ANL 150 amp fuse).
I didnt meant to get off on a tangent here. I just wanted to toss out the aftermarket alt idea in case it was something you had not considered. I like to get more alternator output when I can, even if the stocker was doing alright.
Good luck.