I would get 2x80gb's so you can fit everything on it.
Performance should be better and sequential writes won't be too far behind either but you will have enough space to really enjoy it.
There isn't anything worse than running out of space.
Edit: If your struggling for space, your not exactly taking advantage of the write speeds anyway! so your not actually downgrading even if the E is still 'considered' better! So my advise is pretty much the same as before.
Edit: Actually 3x 80's
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