I use my Craft Robo AAAAAALLLLLLLLLLLLLLL the time buddy, and it's a great bit of kit!!! Only does A4 as standard, but can be set for longer custom lengths, but still A4 width! Not massively expensive either, just make sure the software is compatible with whatever OS you are running on your computer!!
Any advice on what ones of these to buy, give Graphtec a ring!!
Otherwise it seems like you're looking for silly money for a larger one!!!
Hope that helps!!
Clive
PS makes cutting chequers soooo much easier!!!