I don't think you are crazy. I own a GFA-5802, GFA-555, GFA-555II, two GFA-545II, GFP-555, GTP-500II, GDA-600, GCD-575, and GCD-750. I think Adcom offers a really good price/performance value.
Regarding the GFA-5802, I encourage you to give it an hour to warm-up before doing any critical listening. This was the first piece of equipment that convinced that some gear is in fact better when warm. I use my GFA-5802 to power my big Infinity RS 9 Kappas, but have not yet listened to it driving the Forte IIs. However, judging from time listening on the 9 Kappas, I would say that when warm the GFA-5802 has a smoother top end than both the GFA-555II and the GFA-555. The harshest of these three is the GFA-555, but it is also the amp with the most bass "slam". I also want to add that I never picked up on the different cold vs. warm performance of the GFA-5802 until I updated my source gear from an old Carver TL-3220 (which turns out was VERY harsh) to eventually an Adcom GCD-750 CD player. Once I removed the Carver and eliminated my "garbage in/garbage out" issue, it became clear that the GFA-5802 was a different amp once warm. I have read a number of user reviews which criticize the GFA-5802 as being harsh, and my experience leaves me asking two questions... what was the source gear and preamp? did they let the amp warm up first?