You should probably be able to find a very nice, hand-stitched, 13oz worsted wool, 8yrd for the upper end of the price range you mentioned.

Hand-stitched vs. machine stitched, and wool vs. poly-viscose will both make a noticeable difference in both price and quality. So you have to decide what your preference is in these two categories.

scottishkilts.net (which I vouch for, owning my trad. from them) has an 8yd, 13oz, hand-stitched for $384.25US
they also have an 8yd, 13oz, machine stitched (which I haven't seen in person) for $311.75US.

bear (bearkilts.com) has 8yrd polyviscose kilts for the $225-265US range (depending on your size). If I personally were going poly-viscose, I would probably only get one from bear.