air compressor size????

What i have now--30 gal tank-155 psi max-1.9 hp with 7.0cfm @40 psi--5.7 cfm @90 psi----there is a 60 gal tank 3.7 hp 135 psi rated one on craigslist for $400.00 bucks right now---will that new one be any different????? Or there is a 10hp with a 120 tank for $1000.00 but I would make a lower offer on that one--Steve