I'm beginning to gain some confidence and independence (from shops that I have to travel an hour to get to), and want to start fletching/repairing/replacing

my own arrows this season. I see that cabelas has a seemingly nice arrow saw combo (see link) and would like to purchase. My question is what does the 8000 rpm unit do that the 5000 rpm unit doesn't do? The difference I can see is 50 bucks and 3000 rpm. Do I need the higher rpm to cut carbon arrows? (I shoot A/C/C super lites) OR - is it just that "more rpm = more gooder?"
Also - ANY tips on fletching jigs/insert prepping/vanes/glues etc is more than welcome.
Thanks
http://www.cabelas.com/cabelas/en/templates/links/link.jsp?id=0039351417587a&type=product&cm Cat=search&returnPage=search-results1.jsp&QueryText=Arrow+Saw&N=4887&am p;Ntk=Products&Ntx=mode+matchall&Nty=1& ;Ntt=Arrow+Saw&noImage=0