You might consider a good condensor mic. Best for vocals. I guess it depends on what you want to record, voice or instruments or both.
I've heard that AKGs are good. Neumans are best but terribly expensive. It's even hard to find the old tube mics (U47) for a warm sound. The company has a new one on the market.

The Shures will not give you the best recording. They are best for live performances because they are workhorses.

Recording four people who are both singing and playing is a tall order. Getting a balance will be a chore. The better mics (condensors) generally would be best.

RCA ribbon mics are good for recording voices. Cole, an English mic I think, is good.

Go onto the producer lists on-line and get expert advice there.

Frank