Hi
I do know JoomAce works, but honestly i don't have any experience on AceShop.
Anyway, i do see a problem... it's fully commercial.
Virtuemart = Free
RedShop = Free version plus extra
Mostly We do give preference to free 3th extensions that add on our projects, but you know. Maybe our developers think about it.
Anyway (not sure if it's for this year) but we will have news on next months about a new brand e-commerce solution from GavickPro.

don't tell anyone
Cheers