First of all, you might not HAVE a problem with your gear. Shooting at 3200 in broad daylight is silly, and this could just be user error / your current gear could be fine for your needs.
If we assume that you do have a real problem with speed, though, then a body upgrade would make just as much or in some cases more sense than lens upgrades, but only IF you are upgrading from crop to full frame bodies. Doing so gives you 2, maybe even 3 more stops of speed on every lens by being able to set your ISO 4-8x higher for the same grain as a crop sensor. The 7D would not give you really any better ISO performance.
However:
1) This is generally more expensive than any one or even two lenses you could buy, and is a bigger step.
2) The nicer camera body will depreciate in value faster than the nicer lenses, which compounds #1 by making the body option that much more expensive in the long run too.
3) Higher speed from ISO does not give you the creative possibilities that wide apertures do. A wide aperture = more speed, but also shallower DOF, while better ISO performance only gives you speed. If you usually shoot stopped down, and tend to prefer broad DOF (like landscape photography), though, then this is actually an advantage for the ISO route. Depends.
Basically, if you are planning on buying multiple faster lenses, I would suggest getting a full frame DSLR first if you're on a budget, since it will probably be more cost effective than multiple lenses which all individually solve the same problem.
On the other hand, if you primarily shoot at one typical range of focal lengths, that can be covered with one really nice piece of glass, then i'd suggest getting the glass instead first, since it will probably be more cost effective than a more expensive body that improves other ranges you don't use.
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