You're missing a few things
Mounting hardware and misc fittings $30
TJ07 window panel (custom cut) $120
AquaBay for Aquatube $35
Black Faceplate for AquaBay $15
Aquajet nossle and LED $15
Antivibration mounts for AquaStream $10
Water blocks (2 x NV78 and Swiftech Storm) are more like $230 total
Total increase over your estimate: $405. Not to mention we haven't talked about shipping costs on all these items.
I think it is a natural tendency to be optimistic about pricing when coming up with a total for complicated systems like this...is isn't until you really get into it that you see all the costs adding up.
Anyhow, I don't want to get into big debate, so I'll leave this thread alone now...I just felt the need to defend us a little bit. It tends to get to me when we work hard to provide a great product at the lowest price we can, and then have it be called overpriced