Newbie - Which USED Amp & Preamp for under $2500


My preamp has seen better days and is sounding awful. My amp is pretty weak too. I have $2500 to spend and I need help. I've been looking at the following, any advice would help:

PREAMPS:
Audio Research SP17L Tube Preamp
Quad QC24
Arcam c30

AMPS:
Arcam PI monoblocks
Conrad Johnson MF 2250
Bel Canto Evo 200.2
Quad 99
Perraux 200P
Refurbished McCormack DNA 125

Below is my current setup. I plan on upgrading my speakers in the near future, so I'll want something that will work now and later:

Hafler 9130 amp (x2)
Adcom GTP 500 Preamp
B&W 602 series 3 Speakers

Thanks!
mmrump
At your price point, I would seriously consider(used)...
Preamps:

Modwright swl 9.0 se ($1k-$1.2k) - 6Moons review
EnjoyTheMusic review
Positive Feedback review

Do a search here and on Audio Asylum, this preamp has gotten a lot of good reviews by users.

Art Audio VPS-DM - fully dual mono signal and power supply design. This is a fantastic preamp (1.5k)

SS amps:

McCormack DNA-125 ($1.2k obo)
EnjoyTheMusic review,
Stereo Times review,
Stereophile DNA-225 review(same circuit design, just more power)

Belles 150A Hot Rod or Reference - ($600-$1.6k)
Soundstage review (Reference)

Might also consider Bryston 4B-St or Odyssey Stratos monos

If you are open to newer Class D amps - Wyred 4 Sound SX-1000 or

Channel Island Audio D-200 ($1.3k)
Positive Feedback review
Dagogo review