Planning to 'upgrade' if I might say this my E90 with Nokia E7.

I have one question:
On nokia web site is not stated the RAM even if on web I found posted a 256Mb.

Is this amount of RAM going to be enough for a heavy usage?

I have alot of software purchased on E90 and I wonder if this will be ported soon to E7?

Should I upgrade or wait a litle bit till new models get well implemented?

Cheers,