The quality and reliability of flash memory cards are extremely important.  In early post, how to avoid and identify the counterfeit memory cards were described.  Here are a list of best cards for digital SLRs. 

• Lexar memory cards (including Compact flash card used in Canon 40D, 50D and SD/SDHC card used in Canon XSi.  These cards are professional grade,  fast and reliable.  If Money is not an issue, you can buy them for the peace of mind.

 

• San Disk compact flash cards (ultra and extreme), SD/SDHC card  (ultra and extreme) are the most popular cards used in digital SLRs.  But beware, there are more counterfeit San Disk memory cards than any other brand.

 

• Kingston Compact Flash Elite 133x, Kingston CF Ultimate CompactFlash 266 and Kingston SDHC Class 6 Flash memory card   Kingston memory cards are fast and reliable. 

Related posts:

1. How to identify and avoid counterfeit flash memory cards
2. Best SD /SDHC cards for Nikon D90
3. Best SD/SDHC cards for Canon Rebel T2i / EOS 550D, T1i/ 500D and XSi /450D