the apogee gives reasonable temps but it isn't that good, apparently its known for leaving hotspots on the core. storm g4 is one of the best blocks you can get (impingement type block like specialblend mentioned).
was your BW SE worth it? Is that better than the 745? Yeah am in UK and its only ¬£75. Does anyone know if this leaks at all cos i really couldnt afford for it to screw up my pc. Is the water in it non-conductive or sumthing?
i can testify to both a leaking kit and that it is electrically conductive. a friend of mine fried an entire system not 2 months ago with a bigwater kit.
DO NOT GO CHEAP ON WATER COOLING. i am rather annoyed at the number of people who think they will buy watercooling on a whim. don't just buy a kit because its cheap. if you are going to get watercooling do it the right way. for starters a decent waterblock should probably set you back about the same as the entire bigwater kit. same with radiator and pump. you can't really change the block on a bigwater because the pump is so weak most blocks would not get very decent performance, nor can you change the pump as a better pump would probably have to much flow for the block.