http://www.ngemu.com/psx/index.php
Go there they are the official site of most of the PSX emulators, also check out the forums if you need help...
I'd definetly recommend you epsxe, following by PCSX, PSXeven. VGS and Bleem are the most simple emulators, but lack compatibility so except if you're a total n00b at PCs(which methinks you're not), you should avoid them...
For plugins, anything with Pete's name in them is great...