I have recently purchased a property in Old Town but did search extensively in the SN25 area. Driving from Oakhurst you will experience heavy travel along Thamesdown Drive which has many traffic lights!! although you could go up Lady Lane at the back to avoid this. Since the new traffic layout getting onto the A419 this has become easier. The opinion I had of Oakhurst is the number of properties cramed into such a small area - there are cars everywhere on curbs, grass verges etc.. on bin day it is chaos!! the area is smart - I use to run around there every night and kids seemed nice (no abuse), no graffiti, generally the cars seem quite nice and modern a very middle class area.
The problems you need to consider is prices of property in the area will be kept low due to the continuation to build new houses. Only a problem if you see yourself moving in the near future. If you look at growth since 2000 in SN25 it has shown growth at a rate much lower than the national average and average of other areas of swindon. this is why you can buy that property at asking price £179,000
I would go with Old Town any day!! close to town, ideal for your wife who does not drive, quality built Victorian house with real brick walls!!! great schools, v close to M4 and countryside. Im looking forward to getting into my new home which is a Circa 1890 Victorian property end terrace.
I researched for 3 years and rented in different areas to get the feel for places - maybe you should rent for six months in SN25 and see how it goes - loads of property to rent in the area. its the only way you can get a true idea of what you want!! everybody needs are different and are opinons are reflective to our tastes!!
good luck
ms