You can get the XTC for $800 and the Delta for $1300 at the h2source online store.
Spend the extra money and get the Delta.
My Gobi rack has 4 of the small, rectangular PIAA lights and while it helps, it by no means lights up the night, which is what (I assume) you're after.
If you buy the XTC in pursuit of brightness, you'll likely end up spending another chunk of change on a set of grille-mounted lights and bar to mount them on. By the time you're done, you've spent pretty close to the same amount you would have spent on the Delta.
Not only that, but I've never seen an XTC bar attract women like the Delta does.
