my system is almost silent, and my temps are around 24idle and 28 load max
and sometimes you get better performance out of homemade stuff, like my block is a better performer than other blocks,
im using the big rez with a quiet fan on it... very quiet 80mm fan,
only have 5 other fans in my system and im planning on taking most of them out.... and replacing the chipset and gpu with waterblocks soon
edit: on yea, its DEFENITELY worth it! if you have skills make your own stuff, you get much more sadisfaction out of it(my opinion) unless you screw up a lot of stuff...