which flash card to use\?

i currently using r4 sdhc and planning to upgrade..which card should i buy..
so that:
1)i can play all ROM
2)easily upgrade firmware

Acekard 2/i or the CycloDS. Both have better compatibility than the rest of the devices out there.

I am currently using the AceKard 2i with great success.
miros

m3izero and the acekard. both of these are the best flash cards to use.

acekard 2i