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
I have a Conrad Johnson MF 2250 in my "2nd system", along with a C-J PF-R SS Preamp. Paid about $2K for the pair a few years ago, love them.

I had a McCormack DNA .5 for a few days once. The seller had shipped it so poorly that the entire metal case was bent, & twisted. It not only worked (!), but sounded very nice.

An MF2500, or DNA 1, would be other SS ideas......
Kurt_tank advice is priceless. If you are going to invest in your system, settle on the speakers first or you will start going around in circles; the speakers will then inform your amplifier options. I think your current speakers are not suitable for tube amps in your price range, they really are best suited for SS.
You can thank Kurt_Tank now or you can thank him later.
What ever you do HEED his advise.
I agree you should get an integrated amp instead of separetes, ICs get too costly...

however, if you do buy a power amp do not buy the Quad 99 but the 909 instead, it is supposed to be the better of the two...
As Kurt_Tank mentioned, it was advice that I didn't want to hear, however I'm glad he mentioned it. I'm not in the habit of continually swapping gear and I'd rather have more options when shopping for speakers. It looks I need to start researching Speakers, on which you'll probably see another thread from me shortly asking for advice.
Thanks everyone for your replies. I've been researching each and every suggestion posted.