Hi!
I'm no expert on PC music software for beginners. However, there are many other wise ones here.
Controllers...
Well, instead of me having to type it all again and killing my brain trying to recall all the links that can be found on Google, Mamma, search and other internet search engines I will just mention some controllers and older synths that can be used as controllers.
Look for brands like:
Roland, Yamaha, General Music, Evolution, Kurzwell, Kawai, Korg, M-Audio and Alesis..
They all have been making synths and controller keyboards for as long as I remember. Mind you ideally I think you should get a new controller with it's own USB interface so all you will need to worry about is installing USB drivers and connecting the USB cable.
Buying used gear (be it a synth, synth module or just a controller) is tricky. Too tricky for beginners. I got burned buying used gear several times so it is safe to say that it is unsafe to do. In a long run you also want something that will last you for a long time and is easy and cheap to repair. Most of old synths and workstations (except for a few like DX7 for example) are hard to find in a good shape and even if lady luck smiles at you few years down the road you will break off a switch or the internal battery will give out and you're pretty much screwed. Of coarse you can always buy another controller but I'd go with something new if I were you.
Here's however some of the old synths that you can use as controllers.
Alesis Quadrasynth, QS6, QS7, QS8.
Roland JV30, JV80, JV90, JV1000, XP50, XP80.
Korg M1, T1, T2, T3, O1/W.
Kawai K1, K3, K5, K5000.
Yamaha DX7, DX5, DX7II,SY77, SY88, SY99, EX5, EX7.
Those are synths. You will be able to use them for both sounds and controlling your computer and software synths.
You may also want to GOogle search specs, prices and info on Roland A-series controllers. I've used them all I think. From A30 to A90. ALl are good. A bit hard to find used sometimes but generally they come in a good condition because Roland builds their stuff well) and their service is pretty good. At least to my experience. Aftertouch can be a bit stiff but that's not necessarily a bad thing if you don't want unwanted aftertouch events recording into your sequencer all the time and you don't want to disable aftertouch altogether. That is another story for another time.
Okay. Good luck. Do some searching. Generally websites like Vyntage Synth Explorer provide all the necessary info on older synths and controllers. You will find specs, links, info, reviews and price lists there. Just type in a model name and you can find out anything you like.
-ED-
[This message has been edited by 3351 (edited 09-13-2005).]