Hey.
I have a Jhead and got no problem at all, Probably now after 5 kilos of PLA and 1 kilo abs, never had a jam or whatever,

I am also looking for a new hotend, to get higher temps and such,
Not sure wich one atm, I think Aluhotend will be a decent hotend for the money tho, But i doubt it will be alot better then the Jhead,
E3D is pretty decent.