i like chaos zwei, esp w/ dwgr, and it lets you pump a stupid amount of vit into builds based around it. if you read your opponent right you can catch side-rolls with the r1 some of the time (more often if you unlock) and the rolling r1 comes in handy for side-roll games.
other setups worth swapping to (lefthand/righthand): grass crest/chaos garg halberd, black knight shield/demon's spear OR lightning estoc (lightning for generally superior chip damage. if you're familiar w/ elem resists you should be able to eyeball a shield and tell whether to swap to lightning or chaos estoc), silver knight shield/furysword and lightning rapier
pyro flame is there mainly to sit next to the previously mentioned shields in the inventory for faster and more reliable menu swapping. black flame doesn't hurt to have considering diminishing returns on vit by this point