I had a look at a Biposta at the weekend and it was in lovely condition just like the one in your picture. Wasn`t sure if I would regret not getting an SPS, but I do like the old style decals and the 3 spoke gold wheels. dilemmas, dilemmas!
I think if I had the money I'd go for the SPS, especially as you want it for the long term. The SPS will always be that extra bit special.