[cam2Xrunner]

problem with the seas CA18RNX is it is 8 ohm. I only have 75 wpc @4 ohm, 8 ohm would drop it down to 37.5 wpc. What about the Seas lotus series?

Those mids should play fine off that much power. Have you read this thread yet?
http://www.diymobileaudio.com/forum/viewtopic.php?t=33

Pretty big price difference between the Lotus and the CA18RNX. Either choice will be good though. Just depends on how much you want to spend. I'd try out the CA18RNX. If you don't like them they should be easy to resell.