We use a computer to run a spreadsheet that keeps track of the encounters, (ie hits , rounds of stun etc.) Our battlemats are scratch paper with glorious 1 color scribble style maps and movement.

We don't have a lot of time to play, and no time to prepare, so anything that takes too long to set up doesn't work. Also it is just my wife and I so we can gloss over rules, aprroximate distances and generally narrate whatever we feel like, so the quick and loose paper style does well.