I have played under dms that did not use grids, used dry erase flip mats, custom made flips, and others. Most recently my group has been playing on large lego boards. We've drawn lines every 3 dots and the spacing works perfectly. It is also very fun to put together a lego mini of a character. What sort of different ways do you represent the battle scene?
I haven't had to use my own battle mat in some time, but I own two non-flip battle mats with 1" squares on them, one large one small. Where I currently game frequently we have a mat completely covering a poker table that also uses 1" squares. It's also nice because the mat more than covers the entire table, so the whole thing can be used a writing surface for players and the DM.
I'd like to get a dry-erase system but I haven't found that I like just yet.