Nearly any 61 key MIDI keyboard will work. The choice comes down to preference and if you plan to upgrade to a 'proper' console at a later time. And by proper I simply mean matched manuals in something close to the standard positioning. If you look at the setups on pcorgan.com http://pcorgan.com/Fotos3cEN.html you'll see that even at the 'low end' creativity is your ownly limitation. Early on my second manual was an M-Audio Oxygen 61 that I bought cheap off of Craigslist. I bought it because it was cheap, it fit well on top of the keyboard I had, I knew I could sell it again on Craigslist when time came to upgrade, etc.
For speakers, again, if you are just testing the waters, almost any decent pair of powered monitor speakers will suffice. M-Audio, Behringer, Rockit, and many others make good products. I picked up a pair of Rockits (again from Craigslist) that have served me well (some people have had problems with this brand). Currently I'm using a nice pair of speakers from a high-end home audio system. I'm hoping to branch out into multi-channel audio for my own system (beyond stereo) soon. Adding a subwoofer adds a lot to the experience also.
I venture to say that very few people enter the virtual organ world by putting together their ultimate setup from the start. You send like you want to learn as you go and that will require some experimentation to determine what is most important to you. Of course I know you want it all but everyone compromises at some point, the feel of the keyboards, the ergonomics of the console layout, the quality of the sound card, the amps, the speakers, the number of channels, etc, etc. Few of us can afford to have it all. And if we could have it all (money being no object) we probably wouldn't be reading the DIY section of this forum! We'd just call up the experts and tell them what we want.
I've been fortunate to be able to help others with their setups and this gives me exposure to multiple ideas and collections of gear. I don't think there is one right answer to selecting any of this stuff...