If you look around, you should be able to find an x-valve with extra parts for sale. So I would recommend waiting and buying used.
Still newer to mags, so that next question confuses me. Are you talking about rting?
Um, with the level 10 bolt you won't chop, but you may need a better hopper to keep up if you plan on shooting faster. I currently have a valken v-max. If you're looking for cheaper, a halo or empire b reloader would be your best bet.