Needed advice for Undergraduate Enrollment in US(International Student) near Dallas, TX

Hello

I was considering applying to UT Dallas.
OR SMU

A little intro about myself.
I'm a Pakistani Citizen who visited USA just 2 weeks ago.
And really liked the atmosphere.

I gave my CIE O'levels and got good grades.
4A's and 3B's,

A in Accounts
A in Economics
A in Mathematics
A in Urdu(Pakistani Language)
B in Business Studies
B in Additional Mathematics
B in English Language

I will also give the SAT and TOEFL this October or November.
If I get supposedly 1350+ in SAT's Critical Reading and Math and 90+ in TOEFL iBT. Would I be able to get guaranteed admission in them, what about scholarships?

UTD has an annual tuition fee of about $26000 for 12 credit hours, but lets say I take 15 credit hours then it's about $30K per annum. (Since I am out of state student)
Whereas SMU has about $40K tuition fees anually.
I don't need to worry about living expenses since I can live at my brother's home.

Lets say I get admission in both schools.
What are the chances of scholarship for me if I get 1350+ on SAT?

I have set my mind for now to do the first year from UTD or SMU.
But if later on when I adjust properly and want to do my second year from UT Austin or Rice University would I be able to transfer easily if I get good grades?
Or if not then suppose I do undergraduate program from UTD or SMU, and then for the graduate program I go to UT Austin, Rice or any high-rated universities that are like within 3 to 4 hours of drive to Dallas. Would this be possible?
Or if I just choose to go to any high-rated university throughout USA would that be easy?

Now I'm also confused as to what field to go into.
I have interest in Finance, Accounting, Economics and Business Administration.
And UTD offers this degree that sort of has all of something in it
http://catalog.utdallas.edu/2012/undergraduate/pr…

So this was somewhat that caught my attention and SMU does not offer it
But if I choose for eg Bachelors of Science in Accounting/Finance/Business Administration
It has 120 hours but if I get the double major it's 127 or 132 hours(Please visit the link to get a better idea)
How much extra fees will I have to pay, and will it be very tough or something?

I also wanted to know my chances of scholarship since I am an international student so it lowers my chances and just eliminates FAFSA opportunity.
Moreoever I have a co-signer to get me a loan and supposedly studying from UTD costs me in total 120K when I graduate, and I choose 'interest only' option (Meaning I will pay only interest while in school)
So how much would I approximately have to pay and in how much time?

I know I asked a lot but please help me as much as you can.

Kind Regards
Sheharyar