i had this built by race car builders of so. florida. i was very pleased w/ the results. i spent about $1100 installed (welded). they got the bars very close to the interior w/out burning anything. unfortunately, now that i am building a race car, i will have them remake the whole thing and add the front section (including though-the-firewall bracing to the strut towers). i could probably keep what i have, but they can make a new one much closer to the sheetmetal. this will allow them to more easily weld the cage to the shell.
the price of a custom piece is pretty close to the two mentioned bars w/ options. without the X-brace, they would have charged around $800 installed. no shipping costs either.
nathan: is your harness bar as low as it appears in the picture? i doubt that it is, but i have to ask. the problem w/ a harness bar that is way lower than the seatbelt opening and the drivers shoulders is that one may suffer serious spinal compression in a shunt. shroth's website has good information. also check the requirements for any sanctioning body and/or class in which you may want to later compete.