I just had the same decision to make and after seeing the price tag of the Kanai and MBX5 I went with the Hyper 7 PBS. For about $450 you can purchase a new PBS off of ebay which comes RTR with starter box and all! The K2 and MBX5 only come in kit form which would require you to purchase everything separately at a price tag over $1000. I just broke in my PBS today so I'll have some additional info in the coming weeks. After all my research I believe the best buy for bashing and racing combination is the PBS hands down! It seems pretty competitve right out of the box.