Join Date: Apr 2012
Location: Minneapolis, MN
Bikes: 1991 Eddie Merckx Corsa, 1991 Cannondale 3.0 Road Race, 2008 Bianchi Pista
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No reason to buy 105s for FGSS in my opinion. Tektro makes functional and cheap brakes and levers, if I was buying new brakes today I would go with their levers and either their brakes or sora/tiagra. Buying decent pads makes more difference than specific models of brakes in my experience, pretty much all modern dual-pivot brakes will be more effective than your current centerpull.
EDIT: I reread and I guess you mean you have a single-pivot, which are typically even worse to use than centerpull. Any upgrade to dual-pivot will be very noticable, even on the lower end of prices.