Try underclocking the CPU and see if the issue persists. You could also underclock the ram as well. I'd also make sure your only using one drive in the system at a time instead of reinstalling and then adding the other drive back.
All of the Mice I use have rechargeable batteries. Not typically considered user replaceable. It doesn't affect lag at all. Either the mouse is on and functioning correctly or out of battery. All 3 mice can be used while charging.
For me, The mouse must be wireless. I usually pick my mice based on function.
Because I game in a recliner and use a coffee table for my mouse, wireless is a must.
Function and Quality are second. I use a Razer Naga Epic Chroma for WoW.
This is the only wireless 12 button mouse out there.
If...
AIO coolers are awesome. They have revolutionized cooling for Mainstream PCs.
How come no one has designed an AIO with the footprint of an Air cooler?
I realize that AIOs need cool air from the outside, however this is an easy issue to fix with an additional side fan or good ducting. With all...
You could go with an M3 flat head screw that is just a little longer to make up for the counter sink. It might not be a perfect fit, but it would probably do.
You could also try these guys. http://www.laptopscrews.com/
It looks like they will do custom screw runs for a price.
Actually the best design would be to have all the memory built into the CPU and eliminate the need for External drives all together. Although I think were a long way from that.