I would still probably get the $8 set, assuming you take care of them well, you won't have to worry about them rusting. Just dry them nicely when you are done. I have never understood paying ridiculous money for some of those more expensive or name brand tools. How much better can some metal tweezers be??
I'm not much of an aquascaper but I have a heavily planted tank and I use a set of tongs that have a scissors attachment. Between the tongs and the scissors, they cover my needs.