If you think you're going to get alot of use out if it I say go for it! If it's still going in 5 years time it's basically paid for itself. And lets face it, these days you get what you pay for, so if it's good quality it should last the distance.

I have found the best shop that sells leather vintage style oversized handbags (come nappy bags ) around that price mark. When I get further along I'm going to buy one as a baby present to me! hehe. You can't go wrong, if you love it you'll get loads of use out of it!