the albion dressage square is the best imo, i like the one with sheepskin the best - quite expensive (around £60) but very reasonable for the look of it and the quality of it.
no numbers on it but i HATE that - far nicer to have a disc on the bridle!!!
You can buy the number holders for about £5 a pair, they then velcro on to your dressage square. Personally I like the Equiline dressage squares, very similar to the Albion at a fraction of the price, I never use numbers on the saddle cloth either, like Jem1 prefer a disc on the bridle.