Hi redbarchetta,
For years all I used were the plug-in's that come with Sonar. They are still all I use, only I have added Melda's suite of free VST's, and when I got the demo of Guitar Rig 4 with SPE8.0 (I think it was 8.0), I upgraded that to the full version. The only soft synths I use are the ones that come with Sonar and a free one that Kontakt put out. So basically, I'm one of those users that uses Sonar PE to it's full extent so to speak.
I still say that the old Cakewalk Amp Sim is the best amp sim I've ever heard. It's old, ugly by today's standards, but man it sounds good. Throw Z3ta in the FX Bin with it, and you can have some incredible guitar sounds. The reverb in Z3ta is excellent, I really think it's one of those little forgotten gems.
I know Beepster is leery of 3rd party VST's, and rightfully so, but Melda is a professional company that offers professional VST's. Their free suite of VST's can be 'unlocked' to give you more features for a fee. They are 32 & 64 bit, VST2 & VST3, and use very little system resources.
The only EQ I use now is Melda's free one because it has a built in Analyzer and has a lot more features than Sonitus. It has a built in Sonogram as well, but you have to purchase a license. It's on sale this month for $27 bucks. Normally it's $36. Well worth every penny.
I use them extensively and have never had a lockup or crash because of them.
DO NOT DOWNLOAD THE DEMO OF THEIR 'TOTAL BUNDLE'! You'll sell your soul to get the $450 bucks to unlock it when the 14 day fully functional trial runs out.

It is by far the best value there is though. You get free updates
and upgrades for life. If you buy the 'Total Bundle' now, you get any and all new VST's the put out in the future at no charge, and version updates ... for ever. I've been using the Dynamic EQ and the AutoVolume VST ... I don't know how I'm going to live without them when the trial runs out. :(
I'm not putting down Ozone or any other mastering suite, but IMO, they are way over priced. There are other alternatives that are just a good, if not better.