In reply to womblesi:
I reckon the solutions would be the most versatile and offer something *slightly* new compared to your current shoes. What style of climbing will you mostly be using them for and what has made you think you need a new pair of shoes?
A while back, Torquil said that he gets good results with the solutions but I can imagine the other two being a bit more tricky. Send him an email or give him a call, that's what I did.
I personally didn't love the 'no edge' shoes, though I didn't spend long in them. I've heard they're very good for smearing and for 3D climbing on big holds (I've heard that toeing in on small edges is a challenge, especially on steep ground).
Thinking about what you're currently got, the pythons and very soft, so good for smearing and have a decent amount of toe rubber for toehooks. The VS are a decent all rounder so to be honest, most bases are covered. If you've got loads of spare cash and don't feel 100% happy with what you've got then why not try something else I guess (I do all the time!).