[Gooserider]

I now have two sets of fans, which ones I end up using will probably depend on test results.

The first pair is a set of Sanyo Denki, San Ace fans, 120mm X 38mm, 102.3CFM @ 39dBA from 12V, 0.52A.
($5.00 ea, on sale this month @ Electronic Goldmine)
The other is a set of OEM Panaflos that I got as part of a group buy from some folks on SPCR. These are rough equivalents of 120mm x 38mm L1A's (~70 CFM) but they are allegedly made w ball bearings instead of sleeve bearings. Their hubs are smaller, and the blades are different than the current stock L1A. Some folks say they are also quieter.

My rad is mounted through the case front, about 1/3 is in the case, and 2/3 sticking out. (The part that sticks out will be covered by the plastic front bezel) Both fans suck through the rad, with the bottom fan mounted horizontally on the floor of the case, blowing out the bottom of it (the case is on casters) The top fan blows into the case as it's primary air intake.

The bottom fan is at a right angle to the rad, and the bottom edge of the rad is touching the fan. The top fan is about 1.5" from the face of the rad.

Per Bill A, and some of the fan spec pages I've seen, it is better to have a fan suck than it is to have it blow, but the difference is not great. I'd set things up to suck if I could, but not worry to much about it as long as your duct is sealed up tight enough that you don't have any air leaks. Also look at if you can increase your available space by putting the rad on the outside of the case, or other such tactics. If all else fails, try just splitting the difference so that the fan is sitting in the center of the available space.

I'm not familiar with the Deltas you mention, but it does sound like there are quieter alternatives.

Hope this helps,
Gooserider