The 06 crank is a good strong crank too, and as Ctown said if ya can swing a 98mm cylinder i would go that route and get ya a lil more power out of it.
The 480cc setup 98mm cylinder and decent piston "Diamond or CP" piston would be my choice....Diamond first choice then get a 06 crank there cheap and still hold up very well.
the +4 hotrod crank would need to be balanced to your setup to be 100% correct and true, so if ya can i would stray away from that setup unless u wanna put some $$ into the crank and if thats the case might as well get a Real crank for that money.
This is just my option though.....it all depends on how much ya wanna dump in it.....but....either way if you just get a crank get the 06 crank and a new piston and call it a day if the cylinder is still in good shape.