Thanks to everyone who responded, it's all been very helpful. Due to the lack of space I have (roughly 1.5 - 2" only), I'm electing to cut the radiator opening a little bit and enlarge the hole while using dual pusher fans. I've read both arguments for and against pusher fans, some of it repeated here, but my selection is based more on practicality and space than which is more efficient. Truth is I'd rather use a regular mechanical fan, but I have to run with what I have room for, so pushers it is!!
