The only third party plug I own is this one..
http://www.meldaproduction.com/plugins/product.php?id=MAutoAlignI use it because I get so much bleed between microphones that it's an easy way to enhance my recordings.
I have bought full versions of Breverb and TH2 and the Overloud set of things last summer, but that was all through Cakewalk.
I primarily consider myself to be a 100% Cakewalk guy. I do use my external FX at times, routing through a real compressor or the FX in my RME UCX.
I should add that I'm not a pro. I make $0 year after year.
BTW, part of my thought process is that the hardware will work just the same on Linux. While I rarely make recordings using Linux, I am often booted to Linux (like now). Hardware (nice microphones, pre-amps, FX etc etc) is not computer specific. I never worry if my pre-amps will work after upgrading Windows.
I suppose I should mention that my Interface, the RME UCX, comes with great analyzers and FX. It should be counted like a batch of plugins imho.