Your Rogue preamp is already a solid performer, and I strongly recommend holding off on replacing it until you’ve at least swapped out the stock JJ tubes. Those are known to be mediocre at best and can severely limit the unit’s potential. Try a pair of NOS Mullard or Amperex in the front positions - you’ll likely be surprised by how much the sound opens up.
As for alternatives, I wouldn’t recommend the McIntosh C8 or C22. I’ve owned both (you can see the pics in my virtual system), and neither impressed me. The C8 feels like a toy, and the C22, while decent, is uninspiring and lacks engagement. If you need tone controls and a built-in phono stage, the Luxman CL-38uC is a far better option - it’s in my system, and it easily outperforms the Mac preamps in terms of musicality. And yes, it also came with JJ tubes, which I got rid of within a week of owning it.
That said, don’t dismiss your Rogue just yet. It’s not inherently bright, and a simple tube upgrade could be all you need to get the sound you’re looking for. As for the Mac 2600 or 2700, I haven’t heard them, but I’d be surprised if they’re a dramatic improvement over the C22.