Thoughts:
1. CPU block - MCW6000 = 3/8" tubing, MCW6002 = 1/2" tubing. Performance is similar, use whichever the rest of your tubing fits.
2. VGA blocks - WRT option 3, the blocks I'm using. They are similar in design to the DD 6800 block, but asymmetric for easier mounting in an SLI setup. Source was H2OGun on the xtremesystems.org forums (one week lead time plus shipping from hong kong of 2 days). I got mine with polycarb tops, but he was also offering delrin as an alternative.
Things to note:
They're big and heavy, you may need some extra support for your cards.
They're quite restrictive, the MCP650 or MCP600 are definitely the sort of pump you'll be wanting. They look less restrictive than the innovatek blocks, but it's hard to say without seeing and testing both.
Mine came without barbs, but threaded with 1/4" NPT threads, I put some 40ยบ barbs on, not sure how available they are for 3/8".
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