Need some help with equipment, kaossilator pro, kp3 or sp 404?

Hello, I'm a psy/goa trance addict that would need some tips from some of you guys or girls that make electronic music. I am a REAL newbie so help me out eh?

For a few months ago I bought a korg kaossilator (a dynamic phrase synthesizer) and I started doing some tunes on it, I believe its great for making small loops but I lack some things:
*Playing music that is longer than 16 beats without restarting/clearing the song
*Modifying the sound in various ways since
*Better sound quality, compared to the drum/synth/general sounds in a normal song a kaossilator sounds much worse

What I want is some solution so I can play:
*gear that doesnt need a computer or screen
*that I can play the music live without pre recorded stuff, just start playing. This is mainly because I love to just sit with some friends and take turns to make some tunes.
*I would rather not use a keyboard but prefer to use the arpeggio functions since its faster, but I can play a bit... (or is it needed?)

I am not interested in programs like Abelton live or Fruity Loops, since I dont particulary enjoy sitting in front of my computer when making music, neither do I believe that it should take such time. I like the "on the fly" way much better.

Then I started to research different "sound machines", like in this song the guy uses a kaossilator, kp3 and sp 404 to make good tunes:
http://www.youtube.com/watch?v=kdyZNm8U7dE
I believe he uses the kaossilator to give sound, and as a synth using the arpeggio. Then he uses the sp 404 to save clips of the song (since its a sampler) and the kp3 to modify the sound.

Since I aim to make music that has the same style as my favourite artists like shpongle, kraftwerk and astral projection I believe I would need a mixer/effects sampler to make the different goatrance sound "morphs" and also a sampler to make something longer than a few seconds and to join different parts of a song. It also seems I would need to either get a kaossilator pro because I dont particulary like the kaossilators sound quality.

The question I have for you is:
Is my assumption that all three gear types are needed to make EDM music?
And is there any alternative gear in the approx same price class? (each of these components costs about 350USD)
Do you have any experience with the quality of these gear s?
Some of these products have overlapping functions, is there any way to avoid that?
Does the kp3 support mixing of each of the four tracks individually?
Can I adjust the volume on each unit individually?