Default [Q] Nexus 5 4.4.3 issues and continuing with 4.4.2

Hello, I'm a newbie and I don't know if this has been posted before.
I was planning to buy Nexus 5 in couple of days but I heard that after 4.4.3 update, the device is experiencing certain issues with WiFi and some other stuffs. My work solely depends upon WiFi . Some say that phone has become a bit laggy too.

Just wanted to ask when I receive my Nexus 5, is it possible to upgrade 4.4 to 4.4.2? Instead of 4.4.3?