Decent difference between Santa Rita Ranch south and north (also called Tierra Rosa). The north section generally has better lot sizes (60s, 65s, and 70s) and you will see home prices are a little on the higher end. The south section will have a little more density and the home values will range a little lower. Lots of different builders in the subdivision. Amenities are pretty nice, particularly on the north side. There is a difference in school zoning between the north and south sections if that matters to you.
Other communities you might consider in the area area Morningstar which is directly south and slighty to the east, but still along Ronald Reagan Blvd and Rancho Sienna. Both are similar type master planned communities with several amenities and a wide array of builders and sections. Of course there are even more communities along Highway 29, 183, and Ronald Reagan, but those two are probably the most similar to Santa Rita Ranch and pretty close by.
Like oldarmy mentioned, the commute to Austin from there is a pretty decent ways away. Something to consider. I frequently work in these communities so let me know if you need any more information.