The Silverstone KL06 linked above is 32L
They also make the SG02 and SG11 which are both 22.5L. There should be a few media center style cases (lay flat, about 5-6" tall but very wide and deep) which have one or two 5.25 bays, but I can't think of any off hand.
Note that the SG cases will be pretty tight to work in (though those look like they have a bit more room than my 10.75L SG06, looks can be deceiving). Since you'll be using the front bays, you'll probably not have as much room for a cpu cooler or gpu, depending on mb layout and case design.