It sounds like a fun project -- looking for a preamp without heavy constraints on price. But, at best, we can only suggest what to look at, because it is nearly impossible to guess what sound you would prefer and how the preamp will behave in your system. Personally, I find preamps and linestages to be the most sensitive and unpredictable components when it comes to working with other electronics. Linestages that sounded terrific in some systems can sound aweful in others. For those reasons, there can be no single "best."
It would also be helpful if you would say what kind of features you require (e.g., remote control, phase inversion, balance control), whether you have any space limitations (e.g., Audionote M-10 comes in four very large chassis), and other such detail.
Of the linestages you have listed, I have some familiarity with the VTL and the AR. They are pretty nice units and have good remote controls and are quite versatile. But, there sound is more in the solid state camp than the tube camp, so, if you like that kind of sound, I would say stick to solid state.
If you are looking for the kind of harmonic density and correct "feel" of tubes, and if you are looking for the natural sounding transient attack of good tube gear, you should look into the following: Kondo M-77 or M1000, Audionote (uk) M-10 (crazy expensive, though cheaper models sound good too), Emotive Audio Epifania (I own a version with remote control and all of the teflon cap upgrades).
