Need a big powersupply for my HTPC, or maybe a mod?

I'd go with a 350w since you mentioned gaming (for the sake of upgrades ;) ) just get one from Antec or (my fav PSUs) Enermax or Fortan.
Although I see that your case is a matx PSU so I'd get an Enermax since they have a 270w matx PSU (check the egg)
 
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