Not sure how much help I can be since I've got a 7800 on order and it will be my first android, tablet, jxd,
Basically I was looking at the 73 or the 78, I would have gone with the 73 but could not find a good price on the 7300
Used ones went for 100 new ones run 120-130.. I decided if I was going to spend 100 on a used one, I might as well get a new one for 20-30 more.. and if im going to spend 130 I might as well spend another 40 for the 78 with faster cpu, true separate analog, and flush mounted IPS screen.
I do not know how well the 7300 or 7800 handles mame, the 7800 surely will do better but mame isn't built for speed even on desktops.
If you wait maybe the 7300's will drop in price, the 73 having time on it's side has had custom firmwares for it.. the 7800 is the "new thing" and may still have some bugs.. although it looks like stock is coming in now and those of us with pre orders are expecting them to ship soon.. we hope.
Oh one more thing about mame.. Unless someone has worked out mutli threadeding mame is terrible at it, you'll see a small improvement with 2 cores but get NO benefit from 4.
The way I understand it the mame team has not yet mastered how to split the workload while keeping things in sync.. so the faster the CPU the better, cores be damned.
The Biggest improvement from multi core on mame is that mame can have 1 or 2 all to it self instead of sharing it with the OS or other apps.
This is my exp coming from x86/64 I know android handles things a bit differently but I doubt mame will see any benefit from having 4 instead of 2 cores the biggest benefit is going to be with the speed increase 1->1.6ghz
