Luckily, I found myself two old and cheap PCs a few weeks ago. An AMD 64 x 2 4600+ with 4GB of ram, 2 TB of storage and an NVidia 9600 GT. The other's an AMD 64 x 2 4200+ with 4GB of ram with an NVidia 7300 GS. Not the most beastly of machines for gaming, but way good enough for development. I've been moving over development to them.
So far, I got everything copied over, installed Visual Studio and QT (for Tiled plugin work) and everything is building and running. Took about a half day. Had to go back to the thread to find the instructions to setup the debugger for QT. Thank goodness I wrote that down somewhere

Files are copied over automatically through Dropbox. The mouse and keyboard are synced using Synergy.
I did have a few weird file conflicts through Dropbox where the PC had a really old version of a source code file while the Virtual Box version was the most recent one. Strange because it was the first time Dropbox synced to that PC. But that got fixed.