Thanks for your help, everyone.
I've always wanted to get into tubes and I think Audio Research appeals in part because they offer you tubes without a lot of fuss. From what I've read, their refined output stage lets you get up to 10,000 hours from a set of tubes and that sound fantastic (especially if you locate some beautiful vintage tubes you like). So, yes, I guess I am looking for a tube ARC preamp. If I can't find one within my budget (I'm hoping with luck and patience I might score a LS 16 MKII, Tom Hankins, that looks like a beauty, thanks for the rec) then I'll have to settle for an LS3, Peter, but I'd still be please as punch with one of those units! I'm about to go check out the SP8 right now, Joelk.
Any other suggestions in the ARC line?