Good 808 samples ?
Goldbaby does some amazing 808 kits processed using some nice outboard . Sounds great .
Wave Alchemy make Transistor Revolution , a Kontakt instrument that is built using samples from the 808 & 909 , probably the most comprehensive 808 recreation on the market . Or if you want some different samples that sound amazing , their complete drum bundle is the business .
To make old samples sound interesting , maybe try , as suggested , interesting IR's , or plugins like PSPaudioware's Nitro / N20 , or Sugar Bytes Effectrix , hell there are a huge number of effect plugin that can make crazy new sounds outta your 808 samples .