I have everything possible done to my stock heads except for large valves.
My heads are.
Way ported and polished not just the exhaust side but the entire flow path from the intake all the way out the exhaust. The bowls have been blended and the combustion chambers have a mirror finish on them. The heads are milled 30 thousanths, I had a 3 angle valve job done to the valves and I had trick flow springs installed.
I havent got to run my 90'LX since I did the motor swap but it should go 12's.
Here is the down side I have a grip of cash wrapped up in my stock heads. I would say about 650-750 dollars.
www.powerheads.com sells cnc ported stock E7 heads with large valve and 550 lift springs for $650.00 with a core exchange.