Depends on budget and prefrence..
But as Samwell says the '05's are great.
I've got one and was going to upgrade to an '07 but I prefered my 5 after trying the 7,so I kept mine and spent some money on it,tadao,barrels...never had an issue with it either.
All easy to maintain,try as many as you can,the '05's are soooo cheap at the moment.
Whichever you chose you know you're going to get reliability,considered an Etek?...