Hello Kensetsu, I have the 30's as well. I think you will really like them. They are very resolving, but set up properly, they sound well balanced, clean, and neutral. In my room placement was critical though. I would suggest finding the best location for mid-bass and then add a sub if you feel the need for deep bass. I borrowed a REL-R series sub for a weekend and it blended well and did sound better to me. I'm now looking to purchase a sub too.
Options I've considered are the REL B2, Martin Logan Depth i, Grotto i, or ACI Force XL for a lot less money than the others. Im not sure how it compares with the others however. If anyone has compared the ACI to any of the above, please share your impressions.