Is it worth upgrading from a crop frame to a full frame or get a better lens than a current lens?
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Well to give a good answer to this question I'd really need to know what you have currently and what sort of shots you take the most.
If you are shooting in challenging lighting situations and are not able to add your own light, say via flash or some external style studio lighting, then full frame can really be worth it's weight in gold. I myself do a lot of shooting at the zoo. Flash is not an option, the multipaned glass just reflects it back in a big flare. So I'm stuck using whatever ambient light is available - which can vary widely. So for me full frame was well worth the investment.
It might also be worth considering if you shoot a lot of portraits, because of the sensor size it's much easier to seperate your subject from the background with full frame. They also come in quite handy for landscape shooters, the wider field of view can be extremely nice to have.
However depending on what equipment you might already have, it's possible that not all of the lenses you have for your APS-C camera will be compatible with your full frame camera. On Nikons, for example, DX lenses - those designed for APS-C cameras, can be used on FX bodies... however you have to shoot in DX mode which limits the cameras FOV. So in general if your going to switch to full frame consider the fact that at least at some point you'll probably want to buy lenses that are designed for a full frame camera. The downside is of course you may have to replace some lenses you already have with FX equivalents which are usually more expensive. It's something to carefully consider before going FX.
As for me I went FX not too long ago, and love it. I would not switch back. However depending on your situation it's possible you might be able to get along great with an APS-C sensor camera, in fact if you shoot a lot of telephoto (such as wildlife) sometimes having the APS-C sensor can actually be a bit of an advantage.