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Which derailleur should I use with a Shimano 7 speed freewheel 14-34T megarange in order to prevent the derailleur from rubbing the cassette in 2nd.

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This one.

8 speed mega range

Or this one. Or any 7 or 8 speed Mega Range rear derailleur from Shimano.

7 speed Mega range

This issue can also be an adjustment of the B tension screw on your existing derailleur.

B tension Screw

B tension adjustment gap

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I think the one other variable typical on those 7 speed bikes is whether they have a mech hanger. If they don't I believe you can get a variation on the Tourney that was the correct mount. – Colin Newell May 15 '12 at 7:34
That is true. But if your frame doesn't have a rear derailleur hanger, then you really should be looking for a new bike, just for quality reasons. – zenbike May 15 '12 at 7:53

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