NEW YORK ( TheStreet) -- Every tech investor has a dream of hitting it big. Maybe you've nailed the analysis, or more likely, you've jumped on a hunch. Either way, picking a winner -- ridiculously rare (see Five Tech Stock Losers of 2010) -- can certainly make you look smart or just plain dumb lucky. Consider yourself one or the other if you were involved with any of the following five top tech winners of 2010. No. 5: F5 NetworksF5 ( FFIV) aptly comes in -- where else? -- at fifth among the best-performing big tech stocks of the year. The networking switch maker specializes in traffic speed and security jobs and has long been considered a possible acquisition target in the IT rollup arena. The stock: F5 shares are up 180% over the past 52 weeks, not just on takeover speculation, but also on performance. Setting a theme for some of its gear peers, F5 raised its financial guidance every quarter for the last four quarters.