Sequences are VERY nice if you can get them, but 
unfortunately, most were broken up for sale... 
making the full set difficult, if not impossible, 
to reassemble.  If you're lucky, you might happen 
across a full or partial sequence for sale all 
together (I believe Chaos has two Bakuretsu 
Hunters sequences available right now), but 
they're generally rarer than hen's teeth.

Good luck to you if you decide to try!  ^_^