Buffalo man, cheaper option is to go into sampled pianos. You just need a notebook, audio interface, and you're done. The better sampled pianos (ie softsamplers) are superior to most high-end keyboards because there's no RAM/memory limitation, unlike keyboards. I keep a number sampled pianos for different uses - Yamaha C3, Steinway D, Bosendorfer 290, uprights etc. Each has a different character for different types of music. Also, each are sampled differently. For example, Native Instruments's Steinway is different from Galaxy's Steinway. They are also programmed with different CPU/RAM requirements. My largest piano - Galaxy Vintage D (a Steinway D) is the heaviest one I have and as I said, I use it carefully when I need the details and nuances recorded. I currently have Native Instrument's entire set of pianos (from Komplete), Galaxy Vintage D, Sampletekk's White Grand, Truepiano, PMI's Old Lady (Steinway D) and Emperor (Bosendorfer 290), Kirk Hunter (for use in large orchestrations) etc. I never use piano sounds from keyboards for recording - only in live band situations (when details are not key). In live solo situations, I also use sampled pianos.
If you already have a notebook, you don't need to spend too much to get an excellent sounding piano. It will become very evident in your recording. I can identify a recorded Yamaha/Roland/Korg digital piano almost immediately (even the high end ones), but a sampled piano is so close to the real thing that it's not easy to tell.
But in the end, as Silverbeast said, nothing beats the real thing. I still enjoy my Yamaha acoustic piano and use it for practicing.