Adcom GFP-750 would be a good match and a used one is easily within budget.
Not the only reason to go for it, but this pre was designed by Nelson Pass for Adcom.
The pre is flexible in many welcome ways. Sonics are the priority, but the machine is also a functional tool. As the hub and traffic director for the system, its logistical tasks shouldn't be dismissed. Full remote that controls just about everything (example, balance via the remote is nice to have). There's a processor loop, can run passive or active, single-ended or balanced XLR's (for one input), can reverse stereo speakers with a knob (handy for trouble shooting) etc.
And its a very good sounding preamp. Typically best run passive, but you'll have to trial with the Aleph 3. My guess is that you'd end up using both in different circumstances. For some music you might want the quite and delicate purity, say for sparse vocals, or you might accept the slightest of hardening (not much at all really) to get the extra punch from running active.
Another alternative... you are very lucky, you might find a non-remote Aleph P preamp, for not much beyond the budget?
Bottom line though, I'd keep the Adcom on the shortlist - and don't be put off that Adcom doesn't typically suggest the same kind of high-end equipment as Pass, it is a very good machine.
