I get things that I love! In a way I'm very "sentimental"/"romantic" with my bags in the sense that they really do have to get me at first sight. haha... You had me at hello!
But on top of that I do consider different factors including variety. I have a huge wishlist ever since joining tPF and so now for me to buy something, it's gotta be better than everything else on my list.. so I have to factor in looks, how it complements my current line-up of bags, seasonality, level of maintenance required, use - ie. everyday/going out, price differentials (lol.. $X more and I could get THAT instead!), functionality in terms of what I don't yet have (ie. I don't yet have a small agenda, but I already do have a key holder), and I guess availability too! That's huge factor... whether if I don't make a move and get it now whether that means I won't be able to get it later...