It depends what SF2 you have, most are cps1 and not cps2 which is what those carts are. Alpha is on a cart. Super turbo 2 is cps2 which is on a cart, which isnt cheap either.
If you just want capcom games you should look into the 18in1 cps2 multiboard, will save you a shit load of money and is running off the actual hardware, not emulated
The most important thing is monitor, try to find a nice 25", everything else can be replaced cheaply, cabinet/controls/power supply etc. A new 25" monitor is around 300-400 pending its resolutions and stuff so take that into account when looking at a cabinet, Cap kits are cheap as hell but require soldering and you to know what your doing (lots of volts), you cant go poking around on the chassis but theres many tutorials on discharging a monitor and installing a cap kit, This will take care of almost everything but deguassing & burn.
Dont buy off ebay, everything is over priced by about 600$… auctions are hit or miss, and craigslist as well. most people on cl are dumb as shit when it comes to these and also think there worths thousands.
Like I said, cheap cabs are a dime a dozen, if its scratched its an easy ass fix, wood filler, and a new paint job/t molding make even crappy cabs look amazing.
Art work is easy replaceable, readily available in reproduction form, some original marquees are hard to come by.
Keep in mind if you want 2 joys/6buttons you should have a decent sized control panel, finding a coverted mortal kombat or nba jam would be awesome and not as expensive as a capcom big blue. Dynamo cabs are cheap but I have problems playing with mine with 2 people cause its kinda crammed.
CPS2 18in1: http://www.jammaboards.com/store/capcom-cps-ii-18-in-1-multigame-jamma-pcb/prod_292.html
Klov: www.klov.com (good forum for arcade cabinets/buying selling, finding and LOTS of repair info)
bob roberts: http://therealbobroberts.net/ (has any part in terms of repair you will ever need)
cps2 info: http://www.system16.com/hardware.php?id=795
cps info: http://www.system16.com/hardware.php?id=793