I agree with this thread, trials seems to be purely about trials, and nothing else which is great. I think it's mostly to do with how rare it is, and I like it that way.
I had the cheapest ones which where on Tarty a year back, but they ripped pretty easily.
When I get a new bike, I'm going to opt for foam grips as rubber grips always give me blisters regardless of if I'm wearing gloves or not.
Onza default grips are really bad.
I think I had some Viz ones from Trials-UK. They where still rubber, but a lot more bearable, especially with gloves.
I'll have to try these foams for my self, when I get a new bike.
I wouldn't bother changing the cranks yet, they're pretty good cranks imo.
As others have said, I'd suggest better pads for the back, and a booster seen as they're pretty cheap.
Also I'd suggest new grips, the default Onza grips hurt a lot.
You don't lose picture or quality, if you use the actual resize tool rather than dragging it down. And saving it as a .png will keep the quality intact.