If you ever want a chance at getting photos as good and sharp as a professional, then you need a tripod.
Even the steadiest of hands and VR/IS cannot compare to a decent pair of legs and a sturdy head. One of the differences between an amateur photograher and a Pro - 99% of the time, a pro will have a tripod with them, everywhere they go. Now I appreciate that I'm not pro and (as far as I know) neither are you - but I do aspire to take photos that will equal or surpass those taken by professionals. A tripod is the first step to getting pro-quality, tack sharp images.
I'd also add that I find my tripod an important compositional tool. I take more time looking for better locations rather than just settling on the first I find. I have to think about the height of the camera, the angle of the lens etc and how these decisions will affect the composition.
Finally, the one problem is that with everything you buy in photography, you get what you pay for. The one I own now is a Slik Pro 340 Dx (don't let the Pro fool you, there are much better legs out there) but I'm happy with them for now. One problem is the max operating height is around 5ft 6". I'm 6ft so its not ideal and at max operating height, you lose stability when using the centre column. So I tend to leave it the centre column lowered and let my back suffer. If I was to upgrade my tripod I'd expect to pay about £150 - the Manfrotto 190proxb is extremely popular, with a good sturdy head attached I doubt you'd need to upgrade for a good few years.