pjkfarm

The clumping bamboo you speak of would do well and not interfere with your bananas as long as they are 5 or 6 feet apart. They use very little water. Clumping bamboo spreads VERY slowly - we are happy if we get 2 to 3 inches a year - and if after 5 or ten years it looks like its getting too close to something, very easy to wop off the edge - and either have a free plant or chuck it. Clumpers will grow anywhere from 8 feet tall to circa 20 feet - just decide on the size you want (rufa is a very tough one and not tall - but best to simply google them Fargesia ______ will get you what you want. Fargesia robusta is also a nice one, but take your choice - probably 10 easily avalable varieties.
Running bamboos are a different story and can become a real nuisance if planted in the wrong place (like pretty much any plant, bananas included :-) as they can spread 5 or 6 feet a year (which we also love as we grow the stuff for the Pandas at our Zoo here in Washington). Running bamboos can be controlled with poly barrier, not cheapa, or if enough land, tamped earth - we have many dirt roads which cut through our bamboo groves and they provide perfect barriers - bamboo has VERY shallow roots and hates compacted soil (also wet soil and water - a creek becomes perfect barrier - in fact we have part of our collection on islands - 50 varieties on 50 islands - a real maze which we boat through and enjoy the critters who like the jungle :-)