B&W 805D alternatives

Mid line used Verity. Used Magico if you can scoop them up. Might need more power on low grade magico. Devore Fidelity is nice. Dynaudio. Hard to tell based on your input but this is the way I would look. So much variation in just these three.

There has been a pair of magico v2 for sale under 8k for months on here.

If you want to stick with small monitors I would look into Vivid v1.5. This review compares them to the Olympica.

http://www.ultraaudio.com/index.php/equipment-menu/437-vivid-audio-oval-v1-5-loudspeakers

"Getting rid of B&W speakers is always a good thing."

Not always true. I replaced the Vandersteen 3A sig with the 805Di and a pair of subwoofers and I'm a happy camper now.

Private sale of the 805D is going to net $3000-$3500, based on most recent sales records available. This puts the budget $5k, give or take. 75 wpc with KT88s is fairly dynamic but focus on high efficiency +/-87 dB. Is the preference to stay with monitors or full-range floorstanders?

Agree with the others that it's hard to make good recommendations without knowing what you'd like to improve, but I don't blame you for having the itch. IME B&Ws are good sounding speakers, but when compared directly with some other good brands they sound kinda flat and lifeless -- just my opinion and my ears. Also, if I owned B&Ws I just wouldn't power them with tubes (unless you can afford high-powered tube amps), not that they can't sound good with tubes but I've found they appreciate and wake up more with some good solid state power driving them. Again, just my experience.

Two makes I've heard that sounded much better to me and that are more tube friendly are Joseph Audio and Silverline. Their imaging and soundstaging are far superior to what I've heard out of any B&Ws, and if those aspects of sound are important to you they could be well worth checking out. I've read one of the strengths of your amp is its soundstaging ability, so there may be more to be had there. If you're looking to stay with monitors there's a nice pair of JA RM7XLs for sale here, and if you're open to floorstanders there's a pair of Silverline Sonatinas (latest model, albeit one speaker has some scratches) that are both in your price range. Personally I'd take either of those in a heartbeat over the 805Ds, but again that's me.

Hope this helps, and best of luck in getting rid of the bug.