get the 636. last i saw the duc 748 went for around $14K? i could be blowing smoke out my ass so definitely check first. in one of my mags, they say the duc is nice, but it just doesn't have the rawness to compare with other 750s. and here's an article on the 636 (and the 6rr)
http://www.amasuperbike.com/2003-Jan/030107c.htm
here's one on the new duc 749r
http://www.amasuperbike.com/2004/Mar/040322c.htm
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and thinks it's really funny when her nose goes bloody
'cause the blow is so yummy and it keeps her tummy empty
and makes her act more friendly