Looks like morrell has a good one for field points. Its a bag type target and lots of good reviews. As far as fixed blade broadheads and pratice mechanical tips I'm still looking myself. Can't find a highly rated review for them.
I use to use the Block target but the crossbows shoot so fast now not really sure how well they would hold up. Just a little wear and the bolts were burying past the fletching. And removal take a little effort with the Block