The Ultra-Curve is Good...perhaps a little too overkill for Mobile applications since it is more suited to 5kw+ Sound Rigs and larger P.A Applications.
I would say that if your Sound System is over 2kw, and the EV, HK, Bose, Mackie Etc High End Equipment then the Ultra Curve would be a Very good buy for your system
If however, your System is below this, then you would benefit to the same extent from the use of a 31 Band Graphic Eq.
All systems benefit from the use of A Sound Enhancement Processor, I personally recommend the Behringer EX-3200 which can make your P.A system sound more natural, as well as adding additional Bass & Treble to your EQ.
You can find info on the EX-3200
HEREIf anybody uses MP3's of 128kb bitrate and above, will also greatly benefit from the addition of a Sound Enhancer.
If you've already had a quote, then email it to me and I'll see if I can better it for you.