I would not bet on VTL 2.5 and cannot say that it's best buy under $2k or even under $1k. Off your list I woud picl BAT or Melos. I would add Pass L passive-active preamp. (only used availabe for arround $1k)
Best Pre-amp under 2k-USED
I'm having a hard time deciding on a pre-amp. Being fairly new to this hobby, I'm not even sure if I want to go SS or tubes. I have been seriously considering: Krell KRC-3, Conrad Johnson PFR, Levinson 38, Adcom GFP-750, Classe 47.5 and 50 on the SS side and BAT VK-30, Rouge Audio 99 and Melos MA-333r on the tube side. Also included in my list are various models from Audio Research and Pass Labs. I definately want a full function remote and would like to have the flexability of HT pass through. I'd like to get a unit that is considered a "high-end" product which will also match well with a Citation 7.1 amp and an Arcam FMJ CD-23 cdp. Speakers will be my next purchase (right now I'm switching between an old pair of ADS L-710's and a pair of Wharfedale towers.