James, you and I have approached very similar situations at very similar times. I'm also one of those 'dumb' performance majors and was recently in the market for a bass.
I knew F, had used F through the school (a PT-16) and had gone to some of the big shops looking at F's. As with you high chops have never been a problem. With that in mind one of the things I was looking for in an F was a kicking low end, the PT-16's low end sucked and it was the only drawback to playing that horn. New horn = major investment and I wanted to be completely happy with something this expensive. The F's I was digging were the big MW's and Mira's like the 45slz, Firebird, etc. and the big Hirsbrunner (my prof plays one and it friggen plays itself in your hands...mucho $$$ though)
I had no experience with Eb but when I saw this York Eb on this board for sale (I have a bit of York fetish too

) I decided to give it a shot, it makes the sounds I wanted in a bass.. kicking low end, sweet high end, manageable tuning, and a lot of flexibility in terms of weight of sound. It was also $3200 as opposed to some of the F's 6k-15k.
I guess the point I'm trying to make is that if it sounds good, go for it. And being open to Eb can open up some sweet deals. If the horn is good, there are a lot of dog Ebs out there, go for it. Do it now, as a CC player with no F experience the feel and fingers of an Eb can be a bit of a mind-bender, you don't want that too close to auditions or in grad school you'll want to focus on making music not learning fingers. And I do view this Eb as probably something temporary, I love it and think it was a great purchase but I know its not a be-all and end-all solo horn Sometime down the line I'd probably like to spend some big $$ and move up to a real high-end F if my profession at the time can support it and I can justify it. However, as a College student with a couple grand to use look for a good deal over the perfect horn. If this $1800 Eb can be played to the same level as some 4-6k F's, it's the smarter choice.
Ithaca College, B.M. 2009
University of Nebraska - Lincoln, M.M. 2017, D.M.A. 2020
Wessex Artiste
Wessex "Grand" BBb, Wessex Solo Eb, Wessex Dulce