For reference, an i3 is probably somewhat less efficient regarding memory usage, so I'd go ahead & skip the 4gb RAM machines, though if you find a deal on one with 8 I'd say it would probably be fine.
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"Standing on a well-chilled cinder, we see the fading of the suns, and try to recall the vanished brilliance of the origin of the worlds."
-Georges Lemaitre
"I fly through hyperspace, in my green computer interface"
-Gem Tos