Profiler heads are probably the best aluminum head for around $1000. Do not even consider ProComp heads no matter how attractive the cost--absolute junk.

www.profilerperformance.com/sbc-heads-176.html

Iron Vortecs are less expensive and a very good flowing head but you will have to use a Vortec intake manifold.

www.summitracing.com/parts/SUM-151124/