OK.. Lemme try and answer this as swiftly as possible..
SE is strictly software development.. thats all you do.. is maximize your time creating or improving software.
MIS == VERRRYYYY broad scope.. can go from anywhere from software dev... helpdesk.. director of projects.. very very wide range.. so if your unsure then this is probably the best spot for you..
Now CS is a bit different as it is the STUDY of technologies.. this is also a good choice if your unsure because it covers all basis.. but CS is probably better for a sales rep .. keeping up on theory's and technology is always a + for a sales rep.
These are just my opinions... for example..
I work for a MFG Company that makes nearly 65M a year.. and here is my job title(no I am not kiding)
Systems Administrator/Data Base Administrator/Software Development Leader/Security Analyst/Enterprise Messaging Manager
OK think I covered evberything there?
Now what did I take in college?
Drumroll....... NONE... finsihed a single semseter in Brooklyn NY.. then Moved to New Jersey and started my carreer... walked into Testing centers and passed test..
A+/CCNA/MCP/Network+ (the useless list goes on and on)
I currently use these as toilet paper in the bathroom..
I guess what I am saying is.. expierence > school
Just the facts.. so i would get out there and start finding out what it is you like to do..
I encourage others to stay in school no question.. but I am just saying don't think to hard about it because you can land in an all-in-one position such as myself where focussing on single subject matter means nothing..
you dig?