Thanks for all the comments.
I was actually intending to buy the 127 or 150mm - I'm not the most patient person around, and I was thinking I could pay it off in a month or so. Then I realised that this would be a mistake - I knew I'd definitely wish I'd got the 180mm, and probably sooner rather than later! That was the last piece of the puzzle, and so I put the deposit down straight away.
It's going to take longer to pay off, but the wait will definitely be worth it.
|