What a bummer. What do you think would be a good Ampex mono or two track Deck to pick up that wont break the bank?
An AG-440 is by far the best choice for a variety of reasons, generally speaking. But the real answer is whatever you happen to find locally that is in working condition at a fair price. Most likely, this will be a 440! The biggest problem with Ampex decks is that they are the size of a washing machine (though you can rack-mount them ... most will be in the roll-around console). And most have been worked to hell and back in studios and/or radio stations ... but are probably still running or capable of running with minimal investment or work.
The Scully 280 is another reasonable choice, and though I really like these machines, they tend to have more problems than the 440s in my experience. Out of the 5 Scullys I've owned over the last couple years, only one was really working well. Now I have only Ampex (AG-300 1" 8-track, AG-440 1/4" 2-track, AG-440 1/4" mono) and Teac (80-8 1/2" 8-track). If you come upon a Scully 280 in good working condition at a good price, it's worth considering.
MCI and 3M machines are out there as well, but I have no experience there.
The ATR-700 may not be a bad choice, as RRuskin pointed out above. I've never used one, but it probably won't give you that Ampex mojo ... and the prices are not that far off from a 440. The size is much more appealing however! I've owned many many Teac decks, and they are solid and usually not beat to hell.