+1 what he said!An old German 220 for $500.
Plus this -
http://store.tradingpostsupply.com/sgconv-220-22-t.html
You might be able to find a better price on the conversion, but I have one and it is one of my favorites, and this
http://www.advanced-armament.com/product.aspx?pid=488
Make it as awesome as awesome can be.
If you don't plan to get a stamp, just the German 220 and the factory conversion with a regular barrel are the way to go.
The 220 is the only DA/SA gun I truly enjoy shooting.
I would try to get an E2 gun with the SRS Trigger also.