Unresolved Help Please

Can you please help me with the issues that I have ?
I need to know exactly what kind of upgrades do I need to do to the printer so that I don’t get following issues :

I am using CuraEngine, PLA, 210 Hotend, 60 BED
Sometimes I get these beautiful prints , but sometimes with the same settings I get misaligned in the top layers so I have to STOP the print , this is very frustrating , I don’t know where the problem is, also sometimes I do get clogged and hot end stops extruding so printer keeps going and nothing comes out so it ruins my prints.
I noticed if have a bigger parts , the chances of getting it right is lower, with smaller parts it works better, but the thing is , it works randomly. Everytime before print, I extrude enough filament to make sure its not coiling and it’s a nice continuous flow , then when I am sure that’s ok, then I immediately start the print.
I don’t care to spend more but can you please let me know what the exact upgrades should be or settings . Please let me know . do I need to buy a new hot end. Which brand ? do you sell a better one that works all the time ?
What could be the reason that I get misalighed in the top layers ? why sometimes it stops extruding or extruding randomly so that I have to stop the printer ?
I heard simplify3D is a good one for slice, if I switch to that do you think will help me to fix my issues or I have to change the hot end ?
Please help me since this is very important for me. I purchased R1 Robo3D 3 weeks ago from Frys. I am working with this printer everyday and i can't just spend too much time for each print to get it right. I want it to work all the time.

Any help is appreciated
Arbi

 

Adding an in-line oiler seems to help with the issues you're describing:

http://www.thingiverse.com/thing:422671

A picture of the issue would be appreciated

 

here is the picture

 

Yup try an oiler