£50 budget, kinda wanting mirrored with UV protection.

no idea, but I’d suggest some with no frame round the bottom bits of the lens – makes it much easier to look behind ou for traffic

mirrored ? Are you not in the UK ? I use light-reactive lenses that never get all that dark and they seem fine for me (I do mostly ride with a peak though)

Whatever fits and you like.

Simples.

Save your cash and get these – http://www.thesafetysupplycompany.co.uk/c/276398/1/bolle-contour-range.html

Loads of my mates use them and I use the clear ones all the time to keep mud off my eyes

Salice 006. £50ish