The Ultras have no special needs and the Outlaw receiver will handle them just fine (as would almost all receivers of competent design, excepting very low power or HTiB recievers).
The Ultra's are well rounded and one of my favored speakers, I think you will be very happy with that setup!
Get your favorite music ready and enjoy some great sound quality!
Your question sounds like you may have read too many reviews that talk about stuff like "the warmth of the ???? receiver perfectly complimented the clinical nature of the ????? speakers".
That is BS! Speakers definitely have their own sound, but any competently designed, modern receiver/amp should amplify without coloring the sound. Consequently, any differences between receivers are minuscule compared to the speakers.
That said, once you start applying EQ (tone controls in the case of the Outlaw) different companies choose different roll off rates and frequencies, so of course there will be differences from that!