Put 50% of your stake on now and 50% in 3 games time.
Listen to this wise man, [MENTION=278]MattBackHome[/MENTION].
You might be right in that the odds will probably rise in 3 games time, but the reason we are 2/1 now is that this includes time for Newcastle to falter more than ourselves. If Newcastle have matched us (or better) in 3 games, the odds will be better but the margin for error in winning your Albion bet will be non-existent. If we overtake them or find ourselves separated by GD in that time, expect the Albion odds to tumble.
If you think 2/1 is a good price now, personally I'd take a bit of that. I'm sorely tempted myself...