In reply to Kris Knives comes to BGDF:
Well one idea I had for battlemaster is to convert it with poker chips. so you end up with a board with relatively large hex but which are not huge. The following picture use poker chips with hexes, but it is for another game. It's just to give you an idea of the look.
http://bgd.lariennalibrary.com/uploads/Mainsite/GameIdea/GameIdea2010061...
Personally, I like modular board, since I always aim from print and play, see how much hex you can fit on a letter page and see how you can tile them. It could give you the size of the hex you need.
If you want to put the cards directly on the board like summoner's war, you will need bigger hex. I made a small improvised prototype on the picture below by using Eclipse hexes with Duel Masters cards.
http://bgd.lariennalibrary.com/uploads/Mainsite/Main/ProtypePicture/Pict...