Your questions are answered: Speaker FAQ
HT: Energy RC-50, RC-LCR, Veritas VS Surrounds | Dual CHT SS 18.1s | Denon AVR-888 | modified Dayton SA1000 | Antimode 8033C
Desktop: CBM-170 SE | SVS SB-1000 | Audio-GD NFB-11 | HK 3390
Headphone & Portable K7XX | HP150 | DX50 | E12
Regarding your future plansif you are looking to upgrade your front L and R to a CF tower, I would recommend saving until you can afford the CF-70. I've owned most of the CB/CC/CF speakers, including the CF-30 and CF-70 and the CF-70 is a far superior speaker (of course it costs a lot more too) and to me, the difference in sound quality is worth the extra price. My only caveat with that is you should look to get the CF-70s when they go on salethey have been had for as little as $200/speaker within this past year. Energy has bumped their MSRP up, so the best price I've seen in the past 6 months on them was $275/speaker, which is still a good price IMO. I would not pay the standard $500+/speaker asking price for them.
For those looking into getting Energy speakers, or upgrading their current Energy setup, here are some reviews I've written that may help:http://www.tempestaudio.blogspot.com (haven't updated in a while, but include Energy Take Classic 5.1, RC-10, CF-70, and CC-10)