Personaly I would never by a "Bush" product from Argos.
Many years ago Bush was a well known English electrical company, but the company went bust and the "name" was sold to Argos (similar thing happened to Goodmans where the name was bought by Comet).
So now Bush are only sold at Argos and Goodmans only sold at Comet.
All these companies like Argos and Comet do is get cheap stuff made in the far east and stick the brand name on it. So you have no idea who has made it and what the quality is like.
I would try to go for a decent brand where the company has some interest in maintaining its quality to keep the brand name good.
I believe Humax have a good name in this area, though I personally dont have any Humax products.
Note Freeview HD is not yet available in all areas (I believe) so check you can get Freeview HD.