PCnoobmuch :
Total base meaning no mail in rebates
Riiiiight. So you're rejecting it out-of-hand because the rebates are no good to you? Is that what you're saying?
When someone spends time putting together a suggested rig for you, it's probably a good idea to provide a little more feedback than, "base total is $600..."
Unless you can re-use a HDD or something from an old rig, really the only way I can see of dropping the price on that build further is to drop to an RX 460, or GTX 1050, either of which are going to result in much, much lower frame rates in any vaguely demanding game (BF 1 very much included).
So you can do that if you want to. But if there's any way you can make use of those rebates, or save up for another week or two, you'll end up with a much, much better gaming rig.