Never used a mini although ill give you the example of my two top choices for barrels that I find are goo
My first choice would be a dye ultrlite barrel set. You get many different bores and it is a reliable company, the barrels are also great as they are easy to clean and honed to such a degree that it is so accurate with the right bore to paint batch.
My second choice would be a stiffi switch kit. Comes with many bores and the stiffi is soooo light its unbeleivable. The stiffi is also unique in that it can shoot through nearly all breaks due to a special coating within the barrel itself.
These are my preferences and have found they both work well.