Where did people get the idea that only Lenovo offer Win7?
Dell and HP both offer Win7 Pro on even the most basic models in their Small/Medium Business stores.
(You've really got to wonder about the mentality of people that will grasp as such flimsy straws to "prove" that their own dislike of Windows 8 is rational, but that's grist for a different mill).
Lenovo are currently at the top of the list for our next refresh cycle. We stretched our last lot out a lot longer than originally planned, so overlapping compatibility with our existing Dells doesn't buy us anything, and for basic Office duties, it's really just a beauty contest, as they all use the same components, and Lenovo seems to meet our needs on fit & finish, support and price. (The fact that the Dell website won't tell me whether I can attach a second monitor if I need to definitely puts them on the back foot - their documentation has gone to hell since we last bought office PCs).
I'd really like to buy these basic machines with a 100GB SSD (I'd even go for a 60GB drive - all the data is on the LAN anyway) rather than a 500GB HDD, but HP, Dell and Lenovo all want more than $200 for that "upgrade", turning a $500 machine into a $700 machine!