Looks like the loop is set up just fine in terms of overall configuration. As Miggs said it would look a bit cleaner if you brought the pump into the case but its well thought out all the same.
I quite like the way you've mounted the rad.
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White Night:: i7920 (4ghz), Rampage III extreme (A1), Mushkin XP 1600 (9,9,9,24),SLI480., white MM horizon.
CPU: Feser 220 int.|Apogee GTZ|S.Res.rev2| MCP655.
GPU: PA120.3|S.Res.rev2|2x EK FC blocks| MCP655.
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