Hello,
I have a Geetech Prusa i3 alu for 2 years and I am very happy.
On the other hand, you have to parameterize a lot of things. It is interesting but can be rebarbatif for a beginner.
Advantage, there is a lot of tutorial and project modification for the type PRUSA i3, on the web.
Otherwise there is the model A10, which can be more affordable but less modifiable.
Geetech after-sales service is very reactive.
I hope this can help you in your choice.
cordially