If you're getting a new mini then you have to bare in mind that any warranty wont apply if u get a tuning kit. Thats unless you get the works kit which gives out 200 horses and doesent effect warranty, although is slightly pricey for what it is, but you know you're getting quality. Hartge is probably the next best bet.
It does look like you're wanting more power than that though. I suggest you try and find a works to test drive to see if you really need any more than 200hp in a mini. Im not sure if anymore than 200hp will ruin the minis great handling. I've personally never heard of mini madness....
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