That's almost an exact match for the specs on the laptop I'm writting this post on (different processor and manufacture, but the rest is about the same).
It's a decent price for the system. I'm not very familiar with Quickbooks, but I suspect that computer has a little more power than what you need. In other words, you can probably find a cheaper computer that will be able to handle Quickbooks.
If you're planning to use this for more than just business, you might want to consider getting a machine with a DVD burner. DVDs are quickly replacing CDs, so having the ability to create them isn't a bad idea and generally doesn't cost much extra.
While this doesn't directly pertain to your ability to run Quickbooks, you should be away that that laptop runs at an unusal screen resolution (1280x800). As I've discovered the hard way, it can be a pain in the ass to find wallpaper for that resolution. It give you more screen space than a normal XGA 1024x768, but personally I don't think it's worth it. The 1280x800, while advertised as "wide screen", and is truely wider than normal, is not a wide as a widescreen movie, so if you watch DVDs, expect to still see black bars top and bottom.
Toshiba is a great brand name. A few years ago they had a reputation for making the best notebooks available to the general public, but a lot of other manufactures have become more competitive.
In conclusion:
* That computer should work for quickbooks.
* You can probably find something cheaper if you ONLY want to do quickbooks.
* Getting something with a DVD burner would be a good idea if you're doing more than Quickbooks.
* Toshiba is a good company.