Preamp/ Amp matching

May I suggest that you try Audible Illusions M3A tubed pre with external power supply...it's fabulous and a great buy used. Since your amp is only single-ended, buying a pre with balanced in/outs will be redundant. In order for your system to be "balanced" your amp MUST also have balanced connections and connected via xlr's. Higher gain does not necessarily mean better sound.

Hope this helps and good luck with your pre search.

It is wrong to characterize balanced as "more modern" since some of the finest equipment made in the world today is single ended. I would choose a preamp from a manufacturer that specializes in single ended equipment as equipment that is optimized for balanced operation is not always at it's best when used single ended.

I would add the Conrad Johnson PV-10 to my short list.

IMHO balanced linkage is of only real significance with long cable runs ( say >50ft) as per the professional usage for which it was intended (mixer desk to PA's). I have some McIntosh and Theta amps/preamps and haven't noted any audible difference between the two. Features such as impedance matching, inputs (+/- phono stage), remote, cosmetics as well as overall sonic performance are likely to be far more important than worrying about XLR.

I agree with seminola22 .I used my ARC line stage with balanced and single ended (My power amp ML27.5 has both types of inputs as well)outputs and can't say I noticed any difference in sound quality.Now I am not golden eared either.The Direct input in my line stage provides far better sound than any other gimmick.
I read somewhere that in order to get improvements in sound quality the whole system has to be balanced.Audio research provides(favors) balanced inputs/outputs in all(I think) of their products.As well as other manufacturers .
Balanced was designed for professional applications where extra long cable runs are often used.

Thanks for the responses everyone. I am aware that balanced has been around for a while in pro and home gear. As far as the Audible Illusions, I do like the pre but I would really like a remote. I am currently using a Sonic Frontiers signature phono stage so I can get away with a line only pre. I'll spend some more time on the web checking out all of my options.
I really would like to get an LS-9 due to some fairly good reviews, price, remote and manufacture but I also noticed that most people use it with balanced outputs. My concern is that this could mean that ARC has skimped out on the single ended design of this pre and focused on mainly the balanced circuitry.
Am I being petty? Or is there some valid consideration?
Thanks