1,) Slap it around so it knows who's boss! Love is great but Tough Love is better
. Keep it in a cool, dry, visible place - when it's stuck under a desk or in a corner it tends to be easily neglected.
2,) ^+1 on the firewall - Zone Alarm Security Suite is an awesome program, and I added SpySweeper to it,(even though it has both Anti-vir & Anti-spy) for added protection and they work great together. Cost a little extra, about $20/year but nothing gets in!!
I don't use many filters for my air flow because the ARMOR+ MX only comes with the one on front so I also use an air compressor to blow mine out weekly - Just be sure it has a moister filter on it if it's kept outside and MOST IMPORTANT is that you dial down the pressure coming out the nozzel so it doesn't blow your wires and capacitors off. Both of these, internal and external, cleaning of hardware and software is important.
Use programs like CCleaner (
HERE for free), to keep the unused, broken, and temp files down to a minimum and use it for registry cleaning, defragging and compacting. There are other tools out there you can pay for that will do a better job so ask for them if your interested.
A good >80+ power supply unit will help keep your internal components from suffering from vdroop.
Again ^+1 on the OCCT. I keep it running most of the time (got a serious OC going here so I watch my temps), It's a great monitoring and testing tool.
Get a good defragging tool -disk keeper is okay if you want to pay for one. Power defragmentor GUI, it's
free HERE, and I like the way it runs in a command window.
3.) Case cooler(s)? FANS - The important thing to remember here is to have an air flow design in mind and place the fans accordingly. More fans doesn't necessarily mean more noise. Just get the ones with adjustable speeds and again - make sure you have a positive air flow design. Calculate based on fan cfm's at maximum speed that you have a little more air moving out of the case the you have air you have coming into the case. - Cool air coming in will expand as it heats up in the case giving you a little extra for the outgoing. If you have filters on the influent side that will decrease the amount going in. And it's actually simple planning. If you have two fans coming into the case and they are capable of 25 cfm's then you will have 50 cfm's going in. So hopefully you will have two fans blowing out you will want at least 50 going out, ideally one at 25 cfm's and the other at 30 cfm's giving you that little extra. Get good fans and for appearances you can get a cool/pretty fan controller for a drive bay and you will be able to control the air flow and noise from the front. It's a one time expense so do in wright. You can get anything from these expensive
NZXT Sentry LX Dual 5.25" Fan Controller / Temperature Monitor for about $65 or something a little more basic like these
Aerocool EasyWatch 3.5" Fan Controller / Temperature Monitoring Panel for around $25.
Same goes for the CPU cooler, one time expense. That's not something you want to save money on. There's nothing wrong with the Scythe Mugen 2 SCMG 2100 that JackNaylorPE suggested - it's just that to me that's the one component that you should take the best care of, so get a solid, top notch cooler like the
Prolimatech Megahalems Rev B. For about $65 or $70 you can get one or two fans on them depending on your application needs and space available in your case, (this is where JackNaylorPE suggestion of a full tower case comes in). And you will need to take into account if or when you will be doing any overclocking. Keeping this component cool will help it last a long time and allow it to operate at it's full potential, no thermal throttling to slow it down when you depend on it the most!
If you let us know what kind of case, fan set up (if any), and any other hardware you'd like to upgrade I might be able to help you an what would be a priority upgrade.