If you have the money available to pay for a new A/C unit then just do it. Almost 1700 in repairs on a 10 year old system with no guarantees it will last another 10 isn't sensible to me.
As for $100 a lb for freon, that's beyond steep. He's over charging you.
Get estimates on a new system (not from this guy) and replace the system. The part that is freezing up, that will happen simply by not having enough freon in the system. The valve isn't necessarily stuck or bad.
Last edited by sublime2; 04-11-2013 at 06:03 PM.
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