If you want a res I would suggest going with this pump top
http://www.jab-tech.com/XSPC-Acrylic-Reservoir-for-Laing-DDC-pr-4123.html it is better than Petras top as it is the BEST. You can also get all the parts I listed at Petras at Jab=tech and there customer service is great to and a little cheaper than Petras. I use a T-line instead of a res as I don't really like them but would have bought the one listed but was out of stock so I went with the XSPC reg top.
Asus Rampage/Maximus Formula, Q9450@3.8ghz, 4GB OCZ Reaper pc8500,HD4870X2 w/EK full cover block, 3 Seagate320s in raid0 and Samsung750gb ,Zonar D2X,Corsair HX1000, Water cooled:FuzionV2 ,1 D5/EK top and 1 DDC w/xspc top pumps,(2) MCR320 rads,120mm fans(6),140mm fans (2),Gigabyte Aurora case