If you're serious about getting a supercharger in the spring (you won't be getting a turbo, trust me), then don't do ANY mods now. All the software and intake you've already done or will do, will have to be replaced to install the supercharger.
PS Don't waste money modding a 325xi. You don't have 215 hp with those mods, it might SOUND like you do, but you don't... Enjoy it for what it is, or supercharge it, or buy the 330xi.