I thought I'd update folks on my lens decision after mulling over all the input.
I looked at prices for a SMC DA15 Ltd and they were just beyond my reach at the moment as they really hold their used value (hardly surprising given their reputation). I also considered the fact that it's a lot of money to pay for a lens that would only see occasional use from me.
After much thought and searching I finally went for a used SMC DA21 Ltd and a used SMC DA40 Ltd and the two lenses together cost less than the price of a DA 15 Ltd.
Both lenses were bought on Ebay from Japanese sellers (the first time I have bought from Japan on Ebay) and I must say I am very impressed, both lenses are in pristine condition (in fact they look like brand new), communication was excellent and shipping was unbelievably fast.
I think these will see much more use and if I need wider then I can always stitch shots into a pano.
Thanks for all your input folks.