I agree with Rod - the extension tables are so rarely useful as to be unnecessary. And I suspect you're paying full retail price for them whether you buy them now or later. Likewise, hold off on spare cutter inserts - the included 4-sided ones may last you a lifetime. I also wonder if the mobility kit is worth the cost - many have put nice casters on and had great results. $4100 plus $152 for dial+handwheel is $4250 (plus shipping and tax).