Wiss are a good brand of aviation snips, you`ll want at least three of them, left, right and straight cut. Then theres specialty snips in each style too. The old fashioned metal body snips are always good to have a few of as well, they come in various 'cuts' too. Here in aus your looking at about $35 for mid range trade quality snips and is your doing much sheet work they are worth their weight in gold, if you do a lot of sheet work you`ll find you wind up with a fair collection of various snips.