The 634 would not fit in a single drive bay. The 635 would do so and is close tiled so text appears neater. The 635 also has a keypad, which has gained a lot of support under beta testing recently. As a bonus it also has a compliment of LEDs to showcase certain features. Your call!Ferrari355 said:Well this would be my 2nd lcd from crystalfontz just wondering which one is best.