Yeah a couple of my mates have persols and they are very heavy - it's due to the glass lenses. Beautiful sunnies though.
I'm a bit of a sunglasses freak and have loads of pairs. One of the most interesting is a pair of Loewe ones that are very unusual looking but super cool.
Personally I wouldn't invest in a pair of wayfarers now - you'll be late to the table and the trend is sure to move on.
I personally couldn't care less for sunglasses trends; if I like them and they suit my face, I will buy them. Simple as that :p
Other than that, stick to timeless styles such as Wayfarers, Clubmasters and Aviators. Recently I've been contemplating on getting a Rayban Wayfarer in Tortoise Shell and I might just take the plunge now.
I am willing to pay £100+ for a nice pair of Levi's or Nudie's, or even pay upwards of £80 for a decent shirt, but I refuse to pay more than £30 for a pair of sunglasses.
I personally like Spitfire sunny's, trendy without the price-tag!
I will be purchasing these soon!