Your question isn't frowned upon. In fact, we're excited that your going to upgrade your computer. Hmm, wish I had the money to upgrade mine.
You make it sound as if you want to build a new machine and use some of your old parts to cut back on expense. That, my friend, is not really an upgrade. That's building a new system and using your head at the same time.
If you just want to upgrade your current system, try this website: http://www.powerleap.com
. When you get there, you will have to install some software. Don't worry, I've been here and fully trust this site. The download is small, quick, and very easy to do. When you are done, they will scan your computer's hardware and determine what types of upgrades are compatable with your current motherboard. If you have to replace 3 or more parts, I recommend building a new system from scratch.
If you are interested in building a new system, just start looking for the hardware you are interested in. Don't hold back on ordering a good Motherboard so that it will be compatable with some of your current hardware though. That's a waste of your time and money. If your old parts are compatable with your new Motherboard, so be it. Consider yourself lucky and fortunate enough to save a few bucks. If they aren't, so be it. Buy something new that's fast and up to date.
Two things you really shouldn't skimp out on though is the Processor and RAM.
Hope this helps. Let us know what you decide to do and let me know if that Powerleap website helps you out at all.