The low end Dells suck. I ordered a Dell Dimension 9150 for my dad because he was going to get one of these low end machines. It was worth every penny I paid as I haven't had to fix anything for him after setting it up (Removing all links to IE and Outlook). Most OEM don't ship media cd's anymore they have a program on the drive to let you burn the restore cd. The restore cd's don't let you just install Windows it formats the drive and restores it to the state it was before you took it out of the box. OEM PC's have been showing the licensing agreements before Windows starts since 1995 they just have more agreements now. As for the software you removed you need to know about Dell De-Crapifier it works really well.
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Chad