In the last 2 years, Toshiba has turned to rubbish and Acer has improved 10-fold. HP is still crap, although less-so than before. Lenovo is good, but their consumer-level stuff is so-so.
If I were you, I'd grab the Acer without a second though. You could upgrade the RAM to 8GB for next to nothing.
Brandwise, from what you've listed and my experience over the last year:
Remember that moving to a spinning drive is going to be a shock after your Mac's SSD.
And the keyboard/trackpad on the HP G4 is an abomination.