Guitar, Other Sounds, VST

I'm hoping I can get some real-world user advice on the most efficient and cost-effective way to add or create new patches for my Fantom X. I use my Fantom mostly for live performances, including creating midi files as backing tracks, and am not quite ready to leap into full-blown music production integrated software like LogicPro (which has an extensive library of sounds and emulators) I have had great fun and success with the stock patches and SRX cards, and do a lot of tweaking to get the pre-made patches more like the sounds on an original song (one of my bands is a rock/pop cover band which tries very hard to comp the originals). However, I'm really underwhelmed in particular by the Fantom's guitar patches and effects, and in general would like to add patches that better emulate vintage gear (old Beatles gretch/rickenbacker/vox/fuzz is currently being desired). This also holds true, to lesser extents, with percussion and other instruments. If any of you have the same issue, how to you acquire your additional sounds besides self-creation/extensive tweaking? Are there great vintage sound libraries available to purchase? Or, does one need to create them using VST software, convert to wav., and then sample them to build a patch; and if so, what software is preferred? And, is this wave-based patch creation relatively time-efficient and not a memory-buster for a fully-expanded Fantom?. Any advice?