well from what i know the am4 socket is going to to around at least 1 if not 2 revisions and would be good for updated cpu. but im not sure if i would put a non tech savy person on a platform that is still going threw its baby stages as they may run into a few issues like bios and driver updates.
i never seen it go below that unless it is a referb or open box. new lowest i seen and got mine at was $1099. is it worth it, i feel not really but it is a really nich market. if i had a price in my head it would be a killer $800 monitor. the things that really raise the price would be the gsync and the fact that it dose 100hz. other then that its more of an $800 monitor.
i been using bitdefender and it doesn't bother me other then saying there was a scan results (i set the time they happen) and the weekly security report is available. other then that i see nothing. maybe you need to go threw the settings to figure out what your issue is.