Three Chase cards, sapphire, United, and Ink, with 35k each. I vary between 750 and 800 in the score, and I'm marked down because I don't use a high enough percentage of the credit and never carry balances. I have no cash emergency funds other than a couple thousand in a box under my bed (next to the shotgun ;)), so my cards are an important part of my finances if something shitty happens. I also depend on the business card for smoothing out the financial picture at my business.... We use no other cards and I love Chase's yearly reports on expenditures, which helps me plan and set goals with all the data in one place.
I don't give two shits about my credit report, by the way, because I do not intend to ever borrow any money again once I have finished paying my current mtge. it's really nice to be able to say that!