When you say "analog synth has been the second choice of keyboardist", I gather you meant hardware analog. That's because there's software analog synths.
I guess you are confusing some terms. Analog synths (hardware) will never be the second choice of keyboardist. No matter how good analog softsynths are (like Arturia's stuff for example), it will still be hard to emulate 100% of the hardware analog synths. It gets pretty close, but purists will say they are different.
Yes, the pro about softsythns is it's portabiity, but don't forget it is still limited to the CPU and RAM of the PC. That also means you probably cannot load more than 3 softsynths running at full polyphony in one notebook. There are solutions to that - get a rack of PCs (which is still more or less portable) or a rack of Muse Receptors.
As for sampled pianos, you need to understand softsamplers. Do a quick search in SOFT as we've talked about this a many times elsewhere. The key is not about the sampler but the library. Too much to go into the history of softsamplers and I've said it elsewhere in the forum before. If you ask a more focussed question, I'll try to answer it in this thread.
As for electronic sounds, Native Instruments (absynth etc) are not too bad. There are also those from Spectrasonics (stylus, atmosphere, trilogy) and other 3rd party standalones like Zero-G and Yellow tools.
They can be purchased online. You'll not be able to find them locally.
Too many quesions to answer in detail here. It will take 10 pages! Try to do a search first! I'll be glad to answer anything else not discussed before!
