I second what everyone wrote here.
Check this video also on the subject:
[MEDIA=youtube]67M7fsbLUIU:1[/MEDIA]
Personally I never buy unbranded or unknown brand or cheap chinese caps just for assurance and confidence.
I also never buy extremely expensive, audiophile or "Audio caps".
For Electrolytics I always use Panasonic rated at 105 (any series)
For Film caps, I use Wima, Panasonic, Phillips, Mallory or Vishay
For Ceramics I don't check brands I use C0G/NP0
For Polystyrene, I use whatever the supplier sells
I'm not doing this because I think the caps sound better, but to be on the safe side by using a good standard brand and not paying an exaggerated price.
Paticularly with electrolytics, Panasonic lytics from Farnell are not expensive and the quality is really good
