I would like to purchase a counter/ timer card, which captures a signal in 10ms. I am afraid that the microsoft system and LabVIEW could bring about 2ms delay. not so sure whether PCI-6601/6602/6612 supports buffered event counting?
Yes they do. The 6612 is a newer design with many enhanced features and capabilities. Unless you're severely restricted on budget, it's a clear best choice from that group. (And for certain kinds of measurements, it's the best choice anyway as the others may not be able to do the job effectively.)