Lucky guy!
Well, it depends on how much you want to spend. Tamiya makes the definitive Spitfire in 1/32 but it can cost well over $100.00. To some of us that is a bargian for what the kit offers!
A more cost-effective, albeit smaller option would be the fantastic Eduard 1/48 kits. These can be had for less than $50 and offer a simple Weekend edition with no bells and whistles to the Profi-Pack version with everything but the kitchen sink thrown in. Eduard even offers a Royal Class version which contains 2 complete kits, all sorts of resin and photo etch goodies, and even includes a beer glass!
I'd recommend going to a site like Sprue Brothers, Hannants or Squadron and do a search for "Spitfire"