What version of XBOX 360 is the best...safest?

Don't buy used!!!!

A current console should provide a few years of use without any issues.

The release of "next Gen" consoles means prices should drop.... Seems a new ONE is now at the same price point as a "special edition 360" .

Go with either slim or the E model as they are basically the same thing, with different look. I would get the E model since it's newer, but a slim would do just fine.

I'm like the o/p in trying to decide what to do.

I would presume by 'banned' you mean from 'live' ? If that's the case, it would be well worth while seeing it fully in action prior to buying

There are 250GB models out there you just need to know to look for them. Most E or S models are probably 4GB models, but there are ones with 250GB HDD.

I'd say go for either an xbox360 Slim Or Elite. And i recommend you buy a new one as there's a chance the person that used it before you has been console banned meaning what ever profile you use it won't work. The elite does has have some better things over
the slim like a better cooling system but to be honest i don't think it's worth the extra money. And make sure that the xbox360 you do get has the hard drive aswell.