That is exactly what I did on my Antec. I nibbled out one of the 80mm cut-outs for the front 120mm fan. I have mine blowing into the case and the fan on the other side exhausting into the case. What I refer to as a push-pull sandwich. With that setup, a pair of quiet Panaflo 120x38mm 85cfm fans work great. Unless you are cooling a 220W peltier with the block, the air flowing through the radiator only goes up about 1C, so the setup really does not contribute much heat to the interior of the case. An added bonus it you then have an excellent case cooling fan blowing straight into the area where your video card sits. That strong air-flow keeps my Radeon 7500 so cool, all I use on the GPU is a passive heatsink. No fan and certainly no water block needed for it. I recently wrote an article detailing the heatsink and ramsinks I made for the Radeon, to the tune of $1.68
Sunon also makes a quiet 120x38mm 85cfm fan for a few dollars less than the panaflos.
Peter may not agree with me, but I would recommend the high flow-rate block. It's worth the extra $5.00
Hoot