That's really tight!
No way would you get the Zalman in there. The swiftech will probably fit, other than that various water-cooling solutions would be feasible, including the Coolermaster Aquagate Mini R80 or R120. Normally, these get slagged off because they are no better than the best air cooler, but in your case, you can't fit the best air cooler so an Aquagate might be a significant improvement.