>> Priority consideration
The University gives junior-level community college students first priority over other transfer applicants, including those from four-year institutions <<
>> it is easier to get into UT from a Community College than transfering from another university. Or straight from high school (if not in the top 10%). <<
Sorry, I post maybe once a week now, but this information is dead wrong. I am an 06 alum; I got in at 2002 and have seen dozens of my friends take the path you are trying to take. I don't feel the need to comment on your odds of making it in with a 3.0/3.5 because others have already done that and they are correct that it is extremely tough.
The information above omits the tiny detail that certain UT system schools have 'feeder' preference such as UT San Antonio or Arlington. This only applies to some schools - for example, UT Dallas doesn't qualify as a feeder. When it was 2004 and tons of people I knew from high school tried to get in for their junior year, these feeder schools took most of the slots and people with 3.5s from elsewhere didn't get in.
Without coming off as an asshole, I would consider trying to get into a decent 4 year school like UT Dallas - that will get you a good job - rather than putting all the eggs in the basket of hoping to get into UT. As far as career opportunities go there's a lot in Dallas. The major difference is companies aren't likely to pick you up from UTD and move you elsewhere in the country/world because it isn't a tier 1 school. But getting admitted to a tier 2 school is better than shooting for a tier 1 and missing and being left with an associates' degree when this world really now requires a bachelors' or higher.
The main thing that you lose by going to UT* instead of UT Austin is grad school preference. None of the other UT schools are world-class and that does hurt your chance for getting into a tier 1 masters' program...
PM me if you want more of my opinions, this post is long as it is.