I jam with friends every other month.. at home I am happy with my Line 6 Spider II amp and Software on my PC (Guitar Rig 5 and Overloud TH2). 
When I jam, I take my Line 6 HD500 to the friend's place... although its an awesome processor, I don't use it any other time, so I want to sell it and focus on using my iPAD or iPhone to produce similar tones when I am going to jam. 
These days, I see lot of youtube videos where people are using Line 6 mobile POD, Bias ipad product or others and getting very nice tones out of it. 
Before I invest my money/focus on of these products, I would like to know what you would recommend as an iPAD guitar processor?
I don't have time/energy to try out different products and then decide.
 
Thanks in advance. 
 
 

You're having a laugh aren't you? Pull my finger.

One of these for proper connections, (or one of these if you want something smaller)
 
and this to make the noise.