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TBH any new strings will make them sound much better. D'Addario are not expensive, and they improved the sound of the acoustic that I'm selling. You probably don't want to get too spendy if you're trying out different gauges. Also worth considering the action and how much you play. If the action is high and you haven't been playing much, go lighter to start with, otherwise you will mash up your fingers.
Please can someone recommend some strings? the ibanez hasn't probably had new strings for 20 years (got it from a family members loft) and the Washburn maybe 6 years. Noo idea on gauge or anything at all or. Couple of mates who do my stringing for me normally suggested no less than 10 gauge and that a light or medium-light might be best for my playing style. Don't really know what my playing style is mind you. Cheers