Well, I like the Classic a lot. It's the third example of this model that I've owned, and I've liked 'em all, but you know how it goes with the GAS (especially since I hvae a gear in/gear out policy). So, here's why it's not looking good:
First, the Standard is a little nicer in overall construction (not talking about bling, but stuff like how the nut is cut, etc). It's 3 years older, not sure if that has something to do with it or not. The Standard also balances much better than I would have imagined. I think it's easier to find a Classic that balances well on a strap (might be the small tuners...I dunno), as other Stds I've strapped on before have been pretty abysmal in this category. So I feel pretty fortunate to have found this one.
Second, it's a 2-piece body (the two I've owned prior were 1), with an unfortunate seam that didn't show up in the seller's pics. This is purely aesthetic, of course, but these things matter too.
Third, it's the most fungible of any in the group, I think. In that, I think I can find a very nice example of this guitar almost any time for almost the same amount of money.
Fourth, the specs essentially mirror those of the Giffin, and the Giffin makes it its bitch.
So...I know the Giffin stays, as does the PRS and the Std (by virtue of liking it a little more than the Classic). I opted to spend $200 on a used Squier Jazzy, and that one stays becausae it's worth $200.
I'm not getting rid of the SG for fun. Something of value has to go.
That leaves the Classic and the...wait for it...77 Ibanez Artist. If it ever gets here. I'm starting to lose hope. I've never played one before, but it looked really cool, and I wanted to check it out.