Your current aftermarket choice is limited to TA, sorry. Poston used to make an aluminum 350 intake, but they are out of business. The stock intake is not a bad piece, and the TA's can be found used for a bit cheaper than new.
By the way, the TA and Poston intakes are dual plane like stock, there's no production single plane intakes available, though you can get one custom made for $700+. Actually, one of the first ones made is for sale in the Parts for Sale section.
