Good Copper IC's for 2.5M RCA pre to amp?

Thanks guys so far.
Tweak1: Not sure how much signal loss is associated with a 3M run, but Vladamir at Lamm did not think that would be any problem with the LL2, and it certainly was not a problem with the CAT Ult MkII or my Lector Zoe. I am running from a cabinet to monoblocks positioned between the speakers, so 2.5M is my minimum, and I would not want to go over 3M. Unfortunately, virtually none of the tube preamps I have liked have single-ended outputs, since with my new Lector Digidrive/Digicode, I could run a fully balanced system if I found the right preamp.
Blindjim: I will look into those you mentioned, although I have no experience with either Synergistic Research or Nirvana.

Thanks again Blindjim - you have given me several to look at.

Bill, I agree with you and have noticed no sonic difference between my 1M ic's from preamp to amp, and the 2.5 to 3M ic's I am currently using.

BTW, I meant to say above,
"virtually none of the tube preamps I have liked have BALANCED outputs."

Thanks again guys. For now, things seem to sound good with Purist Aqueous Anniversary (1M)from source to preamp, and Purist Venustas (3M) from pre to my Cary 500MB monos. I have been trying different speaker cables after selling my Venustas bi-wires. I was able to purchase a pair of Purist Aqueous Anniversary true bi-wires. The Aqueous Anniversary line uses copper and gold conductors, while the Venustas line uses silver, copper and gold conductors. The silver in the Venustas speaker cables sort of tipped things up in my system, so the Aqueous cables improved tonality in the direction I wanted to go. I also purchased some Harmonic Technology speaker cables, and I am using a pair of the Pro9 Plus from my amps to the LF posts on my Aerial 9's and a new pair of Pro 9 Reference from my amps to the MF/HF posts. I am fortunate the amps have dual speaker terminals for bi-wiring two separate runs of cables. Both the HT cables are 5 feet long, and for now the bass using the HT cables is outstanding, and the mids are full and rich. My initial impression is that both speaker cables are good, but the HT have better bass while the Purist Aqueous may be a bit "quieter." In a week or two I will put the Aqueous back in and see how I like them. I would still be interested in some copper IC's from preamp to amps, but I need 3M, so I will probably hang out until I see a good deal on something, or... I may stay with the Venustas since the silver in the IC's does not seem to bother me like it did with the speaker cables.