For the pots -
The pots Warmoth sells are great - except - if you are trying to match the exact length shaft in certain gutiars. The Warmoth type of CTS pot has a shaft a little shorter than the "les paul" length (but works) and is much longer than the "short" shaft that many guitars (like thin bodied SGs) require. For project builds, the Warmoth/CTS pots are great, have good taper, good feel, and are very close to stated values.
As far as caps go... the Les Paul crowd, specifically the owners of LP Historic reissues, go all gaga over RS stuff... the capacitors included. There are different tones from different capacitor types. Capacitors have a value called ESR, and the lower the ESR the better job the capacitor does of passing AC through any given circuit impedance. The ceramic disks - high ESR, tend to "sound grainy" some say. Orange drops - very low ESR but huge. Mallory 150 not as low ESR as Orange drops, but good, and a little smaller. BE AWARE - the Gibson "Bumblebee" capacitor is actually a Mallory 150, 400v .022 capacitor, with an outer jacket molded over it to make it look like the old ones. Jensen capacitors are NOT made by Jensen... just rebadged with their name. For that matter, Mallory is not made by Mallory but buy a firm in New Jersey that makes them for Mallory and other companies as well.
To tell ya the truth, those little green Mylar capacitors sound just like all the better capacitors to me, are cheap as anything and small too. You can get them in like 10 or 15 or 25 volt rating (more than adequate). I've been using Mallory 150, but only cuz I have a mountain of them here.