I'm currently building the Tamiya IX. It is fantastic.
I don't have the ROG Spitfire mentioned earlier, but if their 1/32 kits of German warbirds like the He111 (I have built that one), or the Ju88, Me109G, and Fw190 (all in my stash) are any indication, their Spitfire will be a great value for considerably less $$$$ than the Tamiya kit.