Back in March, Maingear entered the world of the all-in-one PC with the utilitarian Solo 21. Even though the unit is now only five months old, it's being replaced with a model that's more attractive, more functional and that carries a lower price. We're most excited that the redesigned Solo 21 is now fully upgradable -- and yes, this includes the Mini-ITX motherboard itself. Available from $899 on up, the baseline configuration includes a 3.3GHz Intel Core i3 2125 CPU (Ivy Bridge), 4GB of RAM, 500GB of storage, a DVD burner, Bluetooth, WiFi and Windows 7 Home Premium. The Solo 21 also supports mSATA SSD storage and can also be outfitted with Blu-ray in place of the standard DVD configuration. You'll also find it supports the VESA mount, should you decide to throw the PC on your wall. If you'd like to become a bit better acquainted with Maingear's latest refresh, you'll find the full PR after the break.