In my opinion, $250 including install is an amazing deal.
It costed me ~$180 for my universal (stainless steel) 2.5" electric exhaust cutout, and another ~$120 to get it installed (while having the resonator removed). (~$300 total)
Also, I think you should probably keep the resonator. My cutout is located after my cats. (So it's essentially a catback exhaust minus the muffler and resonator), and there is A LOT of drone in low rpms once the car is warmed up. It does sound very nice though.
I will probably get a turn down tip so that I can hear more wonderful turbo spooling sounds, and less drone.
Scroll down the following link to see videos of how my set up sounds.
http://www.sonicownersforum.com/forum/t1572/
Hope that helps!