Thanks bettyk 
If you can't beat 'em, join 'em...: I saw a handy little article about pieces you can wear to work and then also on the weekend, along w pic examples, so I'll do a post on that, soon. Cool shoes are an obvious one, and so are jackets / blazers. I think both are worth spending on, as you gets lots of wear out of them.
Re shoes, I have some v high ones, but I wasn't on my feet all day. I wouldn't buy them again, though. I recently bought some gorgeous Zara ones, that look so fierce and amazing. I couldn't even stand for a few minutes, comfortably (to be fair, I am out of practice). They were for a party. DH suggested we just taxi, door to door, but I did think that I was mad to be dictated to by a pair of shoes, so back they went.
Do you vary the shapes you buy? I don't really - I tend to go for classic shapes (almond or pointy toe - realised I don't love round toe heels), but I like to be able to keep my things for years.