buy unmatched cells. matched cells are much over-rated.
buying the newwer IB4200WC loose cells you would get large majority of cells in the 1.20+v at 35amps anyway. i have seen matched packs go bad after a few runs... so whats the "stress test" do?
so long as they hold thier voltages and doesnt dump for the race then your fine.
i been buying loose cells from HK for a while now. $30 for a 6 cell pack, and its great value. as i can afford to buy newer onese earlier, and also afford to buy the newer generation cells as they come out.
dont get me wrong, if i was running a big event, nationals and states, or have unlimited cash, then i would go for the top notch matched pack, but for everyday club racing unmatched is fine.
lots of guys will dissagree, but these people are normally affiliated with a matcher in someway, and prob have never tried making up thier own packs from the newer IB's before.
NOTE: BE WEARY OF BUYING "UNMATCHED" CELLS FROM MATCHERS. ESPECIALLY WHEN THEY SAY "UNMATCHED AND ZAPPED"
AS USUALLY THESE ARE LEFTOVERS AND WEAK CELLS ~ THEY HAVE TO GET RID OF THEM SOMEHOW