Hello Spawnslayer and welcome to the forums,
Ok so right now i have a motherboard at 2.3 GHZ that came with my emachines computer. im upgrading and i am looking for at least 3.0 GHZ.
It's a bad idea to go for pure mhz these days. For example, an AMD Athlon 64 3000+ running at 1.8ghz can trash an AMD Sempron 3500+ running at 2.0ghz.
If you're looking for an Intel PC I don't know much about them other than the most popular 3ghz range CPU is the P4 Prescott at 3.2ghz. Someone else on the forum would know more about Intel based systems than me so I'll leave it to them to answer which mobo and CPU you should get for $200
I would also like it to be able to support a PCI graphics card.
Do you mean PCI-Express? Standard PCI graphics cards are somewhat obsolete nowadays. That architecture was surpassed by AGP and then AGP was surpassed by PCI-E. PCI-E mobo's are becoming more common. If by chance you specifically need a PCI slot for a normal PCI graphics card then it's hard to find a mobo without a PCI slot because many components still use PCI :)
oh and aniother question...if i get a new motherboard and computer case can i use my other hardware in my old computer such as the ram, hard drives etc. in it? thanks
This would depend on the components. Hard drives are somewhat generic and most mobo's these days support both SATA and IDE. You'll need to back up your data before you use the hard drive with a new mobo though because the drivers won't be correct on your HDD which can cause all sorts of problems. So backup data and reformat the drive completely.
RAM - There's different types. DDR333 PC2700, DDR400 PC3200, DDR2 533... List goes on... Check your new mobo manual to find out which RAM it supports and try and find out what your current RAM is then you'll know whether or not it's compatible.
CD/DVD drives are fine for use in another machine. But since OEM's like Emachines include all their drivers on a hidden recovery partition/recovery CD/Branded XP CD, you may need to hunt out the drivers for your CD/DVD drives on the manufacturers website because they wont be automatically installed this time round. They might run off the Windows generic drivers but sometimes to get full use out of them they need their own drivers.
Hope this helps,
Mike