So while I have a fair amount of data, what I need is a simple way to visualize it. If what I have is a simple bar chart or scatter plot, it's possible to put it in Excel or LibreOffice... only to watch those programs choke on a mere few thousand data points (inputting a 120K file caused LibreOffice to hang for about 5 minutes to produce the scatter plot). But spreadsheet programs clearly lack the power for serious visualization information; the most glaring chart they lack is the box-and-whiskers plot. Of course, if the data I'm looking at isn't simple 1D or 2D data, then what I really need won't be satiable with them anyways.
What I want is a toolkit that gracefully supports large datasets, allows me to easily drop data in and play with views (preferably one that doesn't try to dynamically change the display based on partial options reconfiguration like most office suites attempt), supports a variety of datasets, and has a fine-grained level of customizability. Kind of like SpotFire or Tableau, just a tad bit more in my price range. Ideally, it would also be easy to put on the web, too, although supporting crappy old IE versions isn't a major feature I need. Is that really too much to ask for?