It's a tough call. On the one hand, having 3 high quality mid-price strands will give you lots of variety for every day wear. On the other hand, I resonate with the others who have talked about their early mistakes of buying a bunch of less expensive strands, and wishing that they had instead shown more restraint and spent the same amount of money on a few spectacular pieces.
I went a bit crazy this year and bought a LOT of beautiful mid-range pieces. I justified it to myself by saying that I couldn't afford to splurge on a single high-end piece, but that I could afford each one of smaller purchases given that they were spaced out over time. But honestly if I add up what I spent spaced out over the course of the year, I could have easily cleared not only one high-end piece, but probably two. So while I currently have a wide wardrobe from which to pick for every day wear (and don't get me wrong...I do LOVE the pieces I bought), if I had to do it again, I'd probably save my money for the splurge pieces. Or at least have made only one or two smaller purchases and used the rest for the splurge pieces.
That said, it might be a "grass is greener" thing. If I had bought one or two "splurge" pieces, I might be whining about only having spectacular pieces to wear for fancy occasions and nothing to wear in my day to day life, especially given that I pretty much wear one of my baroque Tahitian strands almost every single day to work with my suits, and have enjoyed my white metallics for dressier occasions (despite that whole 'ironic' thing that sparked some fun discussion on PS). Plus, if I'm being honest, I doubt that my invite to galas and awards shows have been lost in the mail, and a special occasion in my part of the world means going out to dinner to a nice restaurant every once in a while, which is not exactly Harry Winston worthy!