Wayno,
I don't know if I'd want a micro to be my first build. It seems to me that doing a 5", 200-250mm would be quite a bit easier for a first build. Just my opinion of course but I've built 6-8 quads now and the smaller they are, the tougher they are for me to build. Keep in mind, I never soldered before getting into this hobby about a year ago so that could be part of my hesitation. I think you could put the bird together within the $300 budget using good quality parts. I've put some build lists on this forum noting parts that I've had good luck with, I'll see if I can find one or two and I'll post the links here. I'm using a Taranis radio so I can't help much with receiver info.
Jerry