I am sure I'll be destroyed by proper audiophiles, but let's break it down:

USB ROCKBAND MICS

The mics I have owned and how well they play rockband:

• LIPS: pretty bad. Pickup and range is spotty, and basically no compression makes it not serviceable
• RB2 Mic: stalwart rock hardware. Not great, but never felt cheated with performance. Unfortunately, age is destroying mine and it sounds like a crackly mess and will be retired with honor
• M.I.C.: totally acceptable and nice to have the buttons handy instead of wrangling a controller. Though buttons kinda suck, so maybe a B- overall

REAL MICS

I think going for a "real mic" to pipe through your console is kinda overkill. It's easy to go overboard and spend a lot of money on something you're not going to get a lot of value from. That being said, I've been batting around the idea of micing my living room to stream vocals, so I do have some thoughts.

• $50 tier: Blue Snowball decent pickups, decent quality. I usually have to go into post to clean up some of the audio for youtube, but this is a great entry level mic and I adore mine
• $200 tier: Blue Yeti Overkill, but awesome. It's on my dream list, but I don't think I'd break it out for rockbanding. This model also has XLR inputs so if you want to continue down the overkill route, this might be the one for you.

I don't have an educated opinion on going full overkill with an XLR setup, but have been considering getting a little mixer to try and run audio magic.

For ear to ear type things you're going to really want 2 separate mics, a normal stereo mic just won't give you really noticeable stereo sound.

Assuming that you're recording on a computer, something like 2 of these would be better in my opinion.

In the future, something like this would be good before stepping up into something more professional.

Blue Snowball Amazon Link

Blue Yeti Amazon Price

Blue Snowball is a good start. You generally want to look at wide diaphragm condenser mics for wind instruments.