Advice on buying a spinning reel

I have a 6 ft, Shakespeare Synergy graphite fishing rod, Medium Action that I would like to buy a spinning reel for, and as I usually go the "combo route", I don't know exactly what to get! I am looking , but I noticed that a lot of the reels seem to have different weights, and I don't want to get the wrong "weight" for the rod. I don't have a lot to spend, so I am trying to hold the cost to somewhere between $60.00 to $70.00, and at this point in my life ( though I hope that will change someday) I am a weekend/vacation fisherman, and I do my fishing in either small lakes ,or ponds and, if it makes any difference, I like to use soft baits. Any thoughts would be greatly appreciated!