tiler burden

hi all

i am just about to order the above from neil at buybrand tools and i was wanting to know will the cutting length be adequate for most natural stone. i know porcelain goes past a meter long but i am thinking more about travetine, marble, granite tiles and slate.

part 2 of the question...

if i am going to be laying alot of 600x600 porcelain diagonally, then is it a case of buying a tx900n?? i have the tx700 and i dont mind paying if it saves me time and makes me money?

any help, gladly appreciated

cheers
ed