The 692 has 4 x 5.25" bays and 6 x 3.5" bays so ten drives. If you use SSD's you can mount 2 in one of the 3.5" bays. It does have the external X-Doc though, but that really isn't a full time drive bay.
The Scout does have 10 bays, 5 x 5.25" and 5 x 3.5". It's cooling is good, but it only has 1 top fan mount unlike all of the others mentioned which could be a drawback when it comes to cooling.
The M59 has 4 x 5.25" bays and really only 5 usable 3.5" bays. The 3.5" bay in between the 5.25" bays and the main 3.5" bay doesn't get any cooling so you have to be careful using it for hard drives. SSD's don't get at hot so it is usable for them though. I would go with the NZXT BetaEVO instead of the M59 as it's a little wider, has the same interior layout, has the same cooling capacity, but can be picked up for $44.82 shipped here in the USA from Amazon. It has better cable management than the M59.
Another good option would be the HAF912. It's priced midway between the 692advanced and the BetaEVO and the same as the M59. It has the same 4 x 5.25" and 6 x 3.5" bays arrangement as the 692, but it also has 2 x 2.5" drive bays on the floor of the case next to the 3.5" bays.
You can put in a 4x3 device to turn 3 of the 5.25's into 4 x 3.5" bays on any of these cases. That would get the 692 or the HAF 912 up to 10 x 3.5" bays. If you also use a standard 3.5" to 5.25" adaptor you could increase the Scout to 10 3.5" bays, but the 692 or the HAF 912 would be a better option for 10 x 3.5" drives.
Edited by ali7up - 4/19/11 at 6:40pm