If you're interested in early Kansas City Jazz, The two volumes of Bennie Moten's Kansas City Orchestra on Frog (Frog 29 & 30) are well worth listening to.
If you're moved and/or imtrigued by Johnny Dodds' playing on the Louis Armstrong sides you have, New Orleans Stomp (Frog 39) and Blue Clarinet Stomp (Frog 3) are both worth listening to, especially New Orleans Stomp, about half of which has Louis playing as a sideman.
I hate to recommend most JSP releases - most of their stuff is material they've taken from other labels who did the real work: collecting 78s and remastering them - but Breaking Out of New Orleans 1922-1929 (recommended by Neal Pomea earlier) is the easiest way to get hold of the New Orleans Wanderers and New Orleans Bootblacks sides, which Johnny Dodds plays on and which are essential.
Finally, do a search and check out threads on the Frog, Jazz Oracle, Hep, and other reissue labels. There's a wealth of information there.