Nice... I've had mine for 2 months now and so far, so good. No real upgrades but did the valve cover gasket, plugs, air filter, cabin air filter and camshaft position sensor. Also put some style 68 rims on her.
I'm finding it's a great balance of economy and style, definitely a good choice for a first bimmer. Let me know if you have any advice in terms of maintenance and also winter driving tips. Oh and I'd like to hear what upgrades you have done too.