Expensive brushes are overrated and unnecessary. By all means experiment with badger, boar, synthetic, whatever to find what you like, but there's no need to spend a lot of money. You could get a decent lather with a toothbrush to be honest. If your shave isn't very pleasant it's not the brush. Try different amounts of water vs soap/cream. If your lather is too watery just keep going with the brush. Too dry is worse. Too wet then it might drop on the floor, but so what?