Of course the mic of choice if you want to use a mic is another kettle of fish, and so is the choice of amp for bugs (or mics).

For bugs, I have found the smoothest sound is obtained by using an OLD valve PA head - I use a selmer 100/6 with 4 el34 output stage, and even use the internal valve reverb a litte to warm up really hard cases, but I expect any other would do. I attribute the difference to high input impedance and not too rapid a transient response. Of course it's heavy and fragile.

For choice of mic, I find the AKG D 880 preferable to the 770 and like both. Ordinarily an AKG C1000s is very clean but I have a friend who has a very extraordinary old Martin, and to capture the subtlety of that (like it or not, it's what the instrument sounds like) the only thing to use is an SM58, although normally I would not use them for instrument at all.

AMps for mics I have not found much difference.