actually the 1000Z is so good i had to buy it
bought it, asked rigol for a new firmware (had the jitter issue, but wasn't that bad as others had here) updated it and i'm more than happy now.
my other scope (hantek DSO1102B) is somehow less utilized now
i love the speed of the 1054Z, it's awesome
the hantek is a good scope as well (and it's battery powered and portable - no mains earth on bncs), but the user interface is "dead-slow" while acquiring with long memory.
the 1054Z is pretty fast with even more memory, actually it's the fastest scope in it's price category.
so definitely the Rigol 1054Z is the best choice as a first scope.