Upgrade questions? please help.

i recently got my mpc 2500 happy days after waiting for months to get it.
but now comes the time to upgrade this baby.

RAM now i was reading up on what people said about what ram to use , but alot of people dont realy give a detailed description of the ram just a few things, im a person who likes quality so i wanna get kingston...
will this work ?
kingston KVR133X64SC3L/256 256mb so-dimm , notebook ram module 144 pin

Hard drive, again i was reading and i like quality stuf so seagate is the baby i want to get. i see some guy used a 120 gig seagate, is 120 gig the limit of what the mpc can take?

USB cable, i dont have one yet and i need to get one asap.?

this next question might be stupid but then again i love doing my research. dust cover i seen two differnt ones one mpcstuff site, but witch one is best to get?

Yes, I'm researching memory right now too

I got the money to get the exm but its pointless if people are getting that same quality for well over a hundred dollars less.

I was looking at this one too, because I can go to the store and pick it up
http://www.bhphotovideo.com/c/product/4 ... SDRAM.html

There are plenty of places I've found online where I can get the kingston ram, but my question is does it make a difference? I've seen Samsung ram going for less, but I've had bad experiences with that company in the past, which left me very wary of samsung products.

okay the usb thing. yes im noob. but it takes the same cable as a printer does. got myself one today.

now some expert help me out with the rest of the questions lol.