I recently purchased an Ender2 3D printer for around $200 and it's working amazing well!
Still learning how to fine tune all the settings.
Here's the mods that I've been making.
Belt Tensioner remixed and inspired by fooyabt
Here are the files.
Here's my Cura profile for the Ender-2, based of Nerys.
Here's my Vase profile, turned out beutifully for this vase that I designed.
This is by far my favourite upgrade and was totally unexpected. I purchased some Anet A8 Nozzles. I'm not sure if it was just because they are new clean nozzles or just better made then what comes with the Ender-2, but there was a noticble improvement in print quality.
I download and printed this filament guide from Thingiverse, works great to stop the 1.75mm filament from rubbing on the Z-rod. However it made this squeky sound, so I used a short peice of PTFE tubing in the hole and now it runs smooth and quiet.