The Cosina-Voigtlander finders I use (15, 21, 28/35 mini combo, 40, 50, 75, and 90) are all very nice. You might look at the 28/35 combo mini finder. It's about 0.5 magnification, and very bright and clean. It's also very small. I've gotten used to it, and I like it a lot, but you might find that the frame lines are a bit too close and cluttered for your taste. I haven't used the C-V 28 finder, but if all the other C-V finders I've used are good indicators, it should be very nice.
The only problem I've found with the 28/35 is that the rubber grommet at the rear to protect glasses is too lose, and might be lost from the friction of putting it in and out of a camera bag.
Lee