Welcome to the forums. The color of the bike, style of Bianchi decals as well as the round World Champ sticker and the shimano light action all point to this being an '88 model. The Strada was a nice basic Taiwanese built bike, three tubes ChroMoly w/ HiTen stays and fork. Looks like it could use a good cleaning.
As for the value?... what did you pay? Would you have paid $20 more? $50? I would say the current value if just what you paid for it. It is a nice bike to get around on and do some working out on but it isn't something you can flip for huge profit.
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“One morning you wake up, the girl is gone, the bikes are gone, all that's left behind is a pair of old tires and a tube of tubular glue, all squeezed out"
Sugar "Kane" Kowalczyk