Looking to get into my first 300Blk pistol. My budget is probably around $1300. Would you recommend getting a complete pistol, or buying a nice upper like a DD and then adding a lower? It will be my HD weapon. I will be adding a Huxwrx Ventum flow through can on the front, so I won't really need to tune it. Looking at BCM uppers and DD, but would PSA uppers do the job just as good?