I'm searching 3D printer kit around 500€ for a while. I found prusa i3 kit from createc3D as best option:

http://createc3d.com/shop/en/3d-prin...1_75_mm_direct

Recently I found two cheap, dual extruder, acrylic frame kits:

http://www.reprapmall.com/index.php?route=product/product&path=24&product_id=99
and
https://www.3dprintersonlinestore.co...r-prusa-i3-kit

I can't decide should I go for dual extruder for my 1st build. If I do, is it good solution to buy one of these cheap acrylic kits and replace frame with steel or Alu?
Reading this forum, I'm not sure any more should i go for prusa i3 at all...

Does anyone know any information about those 3 web shops? Is any of these recommended?
Every suggestion is welcome.