Also, consider where you ultimately want to settle geographically.

Thankyou for reply guys.

1. University of Illinois at Urbana Champaign.: which is reputed but is way to costly. I am not sure that is it worth to spend that much when chances to get TA/RA are very low. Also, do you know about job scopes after masters.

2. Iowa state university: It has really good course structure and high chances to get TA/ RA after 2 semester. But not much people are even aware about the clg.

3. ASU: Course is good. The state has strict rules and very low job n TA/RA scopes

4. Houston: The course fees low compared to other colleges but again if any body can tell me about  job n TA/RA scopes
 

I really confused as to which one should I be accepting. 

As an Iowa State grad, I can tell you that any lack of recognition (or otherwise) from ISU doesn't play as much of a factor to employers as you might think. Graduates of the program get jobs, because they're trained to be good, well-rounded architects. I don't think that you'd be constrained to jobs in the Midwest, either, since a number of graduates have gone on to work in places like Seattle and NYC.

Overall, go with your gut, but don't think that you'll be at a major disadvantage for choosing ISU - you'll get a degree for a great value and a reasonable price.