True you need a VM but performance doesn't have to be crippled. My out of office/at home machine is a Dell Inspiron 5558 (Core i7, 16GB RAM). I stuck an intel 256GB SSD in it, took the free upgrade to Windows 10 and do all my dev work in a few Virtualbox VMs (leaning heavily on mRemoteNG for lots of tabbed PuTTy instances!).
Total cost (including the Intel SSD) was £726 or $1049 at today's rate (exc. VAT). So didn't cost a bomb and gives me a lightening fast machine, windows for desktop duties, debian for dev, a 1920x1080 display, easily replaceable battery/ram/disk and no issue driving multiple monitors.
I also think Windows + Putty is better than Desktop Linux. I'm actually going to sell the Mac (can't get used to shortcuts, don't have money to an upgrade here in Brazil) and buy a Windows PC + Intel NUC for HTPC + Linux box.
Total cost (including the Intel SSD) was £726 or $1049 at today's rate (exc. VAT). So didn't cost a bomb and gives me a lightening fast machine, windows for desktop duties, debian for dev, a 1920x1080 display, easily replaceable battery/ram/disk and no issue driving multiple monitors.