Sims games do not require speed. They only really require enough disk space and sufficient memory. I had a look at the 1100 you mentioned and you should have no problems playing Sims games. Just remember that it can only be installed and played by an administrator (which means having to give one of the kids Administrator privileges..yikes).
Try clicking onto the small business section first, and then the evalue link. I don't understand, but it has shown a higher price for me sometimes coming from the home section. Also reduce the warranty to 90 days ... but going through the small business section should work for some strange reason.
This model has been the subject of a number of threads recently.......and I'd like to sound a note of caution.
The onboard Intel Extreme 2 graphics may or may not support any game you want to play.
If it does then for a casual gamer playing older games you should be fine.
But it may well not meet the minimum requirements for more up to date games and they might not play.
This is where you will hit a problem....the motherboard on this pc does not have an AGP (or PCI-e )accelerated graphics slot.So you wont be able to add a seperate graphics card(other than a very lowly pci slot one if you can find one).
This pc looks to offer a really good value workstation.........the downside is it is not designed with any upgrades in mind.
If you want to be able to run any game you buy then you should look elsewhere