I'm going to go to a liquidation outlet this friday to get some chips for my 6502 computer. Are there any rare/useful/prototype chips that I should look out for?
I already plan to get 6522's, 6551's, and oscillators. Any other suggestions would be wonderful.

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Peter: "Hey Mort, do these suppositories come in any other flavors?"
Mort: "Peter, your not eating those are you?"
Peter:(Sarcastic) "No, I'm shoving them up my butt, Of course I'm eating them!"

The 65 family used to include:

6520
6521 PIA
6522 VIA
6523 TPI
6524 PIAT
6525 TPI
6526 CIA
6529 single-port interface (20-pin)
6530 RAM, I/O, and Timer
6532 RAM, I/O, and Timer
6545 CRTC
6551 ACIA
6552 dual ACIA
6560 VIC (NTSC)
6561 VIC (PALB)
6567 VIC (NTSC)
6569 VIC (PALB) text
6572 VIC (PALN)
6573 VIC (PALM)
6582 SID
5710 FDC
8722 MMU
8360 Text-Editing Device
+other 8000-series that were directly 6502-compatible
(This list does not include the 20 or so 6502 variations like the 6508, or the 65-family microcontrollers, like the 65F11.)

but most of these have been out of production for many years and are rare. WDC is bringing the 65c21 and 65c51 back, and of course the '02, '816, '22, '265, and '134 have no planned end of production in sight; so anything else above could be interesting.

@GARTHWILSON:
could you help identify which ones are currently available and being produced, and what common existing alternatives exist for each of these?

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http://WilsonMinesCo.com/ lots of 6502 resources
The "second front page" is http://wilsonminesco.com/links.html .
What's an additional VIA among friends, anyhow?

So its just the WDC offerings,

Could we step through some of these and identify functional alternatives?