First of all, your VL1 is a good vocal processor and has a good mic pre-amp, so you shouldn't bother with pre-amps etc. anyway.
I cannot give you any advice regarding the flute; I have no experience with that.

For the vocal microphone it is very importand to test several models and makes. Just like any musical instrument each microphone has it's own character. It doesn't allways have to relate to quality. For example: the AKG WM450 C5 is a very nice wireless condencer mic, good quality, great looks.......but I don't like it. It just doesn't feel right for me, I've got to work harder with that mic compared to other mics. Pure personal, just like buying a new guitar; it has to feel good.

Now, assuming you want a wired mic (most capsules are available for wireless systems anyway). The Shure Beta 58 is a top class (live) vocal microphone most singers can and love to work with. I use it as my back-up mic.
I am using the wireless Sennheiser 165 (condenser) for some 4 years now and I really love the thing. It suits my voice just fine and I can do about everything with it. Don't have any feedback issues with it.
Recently I worked with the Audio Technica AE5400 and I was blown away! What a great microphone. Ofcourse, I only heard the sound in my in-ear, but the feel of the mic was absolutely great.
I also have some cheapo Superlux condenser mics, which I use as guest microphones. For that price they are suprisingly good, but they do have feedback issues.

My best advice for you, however, would be to determin your budget and do a mic-shootout in your pricerange yourself. After all: you are the one to play the instrument, so it's got to feel right for you.

Don't be put down by the fact that a condenser microphone needs phantom power: your VoliceLive can provide phantom power.

Mike
www.mikewever.nl