Theres only so much polishing a turd you can do. Not saying the mini is a turd, far from it, but sticking a virtue board in it aint gonna make it magically turn into something amazing. Plus the standard boards are really good, I have had an Axe with the shockwave board and once thought about sticking the redline board to it. £100 board that just does the same thing but has a few extra options to it just didnt seem worth it.
If it was me, If youre set on a mini, I'd save my money on the board and spend it on better paint and theres a few good bolts around that can improve it in a few areas. Theres some really good second hand markers around, if you have a budget, look around and you can usually find something that was like a £1000 a few years back down in your price range. I have bought a second hand marker off here for half the price it was when new last year.
Ask questions about markers and people will respond on here and give there honest opinions. But you could do with having a go of a few to get the feel, and markers do feel and sit different with people.