OP what kind of integrated are you running? There might be another way. I'm no expert but what are you working with?
I run a ZPre 3 in a tape loop on a C20 or MX110z. It adds a Remote for me, a fixed frequency Sub out for a passive sub and line level RCA for sub or main speakers..
I use it for subs only. The C20 or MX110z runs the main speakers via a MC225,240,275.
I paid 300.00 for it I think.. The use of a second preamp use to be pretty common.
Remember though there is a LOT of gain. You better have pretty good routing skills too. LOL Noise can be an issue because of the gain. Mine is still VERY quiet behind routing primarily.
Over the last couple of years, WEAVES and ribbons and very little use of shielding has netted me some fairly low dollar (cost wise) but high quality results in cables.. Really HIGH quality.. To the point of spending more money on cables to increase the sound quality, seems a little crazy to me..
I like the Helix from Mr. Wonka too.
You won't find a product that produces higher SQ. You may find something you like the sound of better, but it's not because the product is better. I found usually it just takes a little time to sink in. Just because it cost more doesn't make it better.. LOL
Regards