Another one who agrees with Cogito.
I'm a single parent and have been since DC were babies (twins). Very limited contact with the father (think 3-4x a year). I actually love it and think that in some ways it's easier than parenting as part of a couple.
I don't subscribe to the male role model arguments. Well I do, but I don't think it's necessary for that male role model to be their father. My DC have experienced no detrimental effects from the lack of a father-figure-type male role model. They are in the top 5% of their school year, popular and I am frequently told very grounded, well-balanced and considerate to others. They don't have problems around 'men' because I have male friends and acquaintances (although none as close as my female friends) and male family members (albeit I don't see them very regularly) - all of whom are excellent male role models. As long as children have good role models of both sexes in their lives, they will be fine. It's not actually necessary for them to have a man live with them.
However, none of that takes away from the fact that as a single parent life can be very, very tough if you don't have a good support network. When you're down with a D&V bug and you have DC to look after, it sucks. When you've had to call your not-very-understanding boss and take your third unpaid day off work because your DC are sick and there's no one else to look after them, it sucks. When you want to go out and can't afford a babysitter, it sucks. When you want to buy something that normally is split between a couple but in this case it's just you and your income and you can't afford it, it sucks.
IME those prices are worth it, but you'd be a fool not to consider them.
In your shoes, I'd do what Cogito says first and revisit the idea in a few years time when the biological clock is more of an issue.