The Beyer's are a great basic studio workhorse, I own at least five pairs. Not the flattest and closed back makes for quicker ear fatigue, but absolutely solid. Combine them with something like Sonarworks and you're gold. I use the Beyerdynamic 1990 Pros along with a pair of Audezes for
mastering purposes frequently, both a bit off your budget limit though... I don't have direct experience with the Focals, but several of my
mastering cronies use Focal headphones and speak highly of them... Sux that you can't test them out at present...