Two primary options to replace the trusty but aging late 2009 mini, both around $200.
1) Late 2012 2.5 GHz i5 Mac mini for $200 - at a local pawn shop. This seems like an absolute steal since this model still seems to be selling on the used market for $450-550.
2) HP Elite 8300 3.4 GHz i7 - make a Hackintosh out of this as it seems relatively easy to do. Plus I can dual boot it and use it as a decent Windows machine.
There is a third option, and that would be to buy the mini in option 1, flip it for several hundred more than I paid and then build up something newer/better/faster. I could probably build a decent Hackintosh with later model parts than that 2013-vintage HP I’m considering in option 2.