Trying to decide/understand what might work best to blend my new DPA 4099 (or use on it's own).. Lots of people recommend Grace Felix and using my existing Walter Woods, but wondering if others have experience with some of the amps listed above that allow blending.. it would be nice to have a backup amp as well... Looks like the following amps feture both phantom power and 2 channel blending with my pickup (realist). I only play upright and only straight ahead jazz, so my needs are for getting the most natural gut/acoustic sound.. thanks to anyone who wants to share their experience and advice. Markbass 800 tube vs. EA Doubler vs. Acoustic Image Clarus vs. Grace Felix II or ???