hahahah NAM is definitely a slippery slope.
Since this is your commuter car I would stay away from coilovers. I just replaced the struts on my car and didn't even think about putting coilovers on. Many people will claim "its a better ride." that is a simple justification for the 1k or more they spent on the coils. What coilover owners don't tell you is that if the wheels aren't aligned correctly, premature tire wear is inevitable. Living in MD and DC the risk of hitting a table top and knocking the toe end off is too great a risk IMO. save that money.
HOWEVER, the 22mm adjustable sway bar is probably the best bang for the buck mod you can do on the MINI period. Understeering is an issue with the MINIs especially if you a more "spirited" driver. don't go anything less or more than 22mm. just make sure its adjustable. at 200 bucks Alta makes the ideal one. I think that this mod makes the car safer, under heavy breaking in crazy DC or MD traffic you might need to make a quick move and you turn the wheel and the mini says otherwise and goes straight. This mod eliminates that understeer so the car does what you want, better and confident steering response.
Id be happy to help just let me know.