I shot a mini last year and i love it, the first batches had issues but they have been sorted now.
I dont think they are too small, i am bordering 6' 2" and i shoot it fine, there is another guy on our team bigger than me and he has no issues either.
Though I have never tried the PM's so I cant comment on them, just that the mini has not done me wrong this year,
as you say i would try them both,
if you see MK Storm about ask them and they will let you shoot their guns,
They mostly train down at bicketwood, try and contact walker 7 or bolter on here if you are interested.
Thre stako will be fine, i never really used an egg, dont like the shape or weight distribution on them, i use a halo but as long as yours can feed 15 bps then it should be fine.