Do you really want to live in North Swindon..? Sure, it's lively now with lots of young families etc, but with that comes all the issues of problems with schooling, future teenage issues and those houses are very crammed in to each other. I personally wouldn't live there. Apart from anything else, you've only got Isambard as the secondary school and I've heard very mixed reviews about that.
Wroughton is a more established area, and I think the house there would hold its value better over the years. Ridgeway is a good, established school so I would probably go for that.
How close to Swindon do you have to be...? There are some gorgeous villages just outside where you can get something really nice for your money (you can probably guess the one I'm in, and you can get 4/5 beds there)... Houses outside Swindon tend to hold their value better than ones in it ime. Why not look at the villages by wootton Bassett, Purton, wanborough, or further afield the villages put towards Cirencester, Marlborough, Fairford?
Whereabouts in Swindon do you need to get to..?