with heads and a cam it would be a great investment. cant believe youve done so many mods and still kept the stock maf. what size is your tb? you didnt mention. if thats stock, get a larger one
It will really depend on what your future plans are for the car... Forced incuction or spray, you might want to hold off on getting parts until you know what you are going to buy / or have.
For my car I would like to have a 73mm or 77mm MAF and a 65mm TB. Getting more air into the engine means that you will make more HP.