Hi there,
I am not a pro and I am also still learning... I think any synth could be nice fit, it only depends on how much time do you invested in your ones.
Anyway, here's my list:
Intelligent Sounds and Music - BazzISM2 - For Basket ball and zap kicks, it looks crap, but one of the cleanest sounding kick generators... And only 30 euros...
Native Instruments - Massive - Saw Basslines, all sorts of leads leads, fx-es.
Synapse Dune CM - First of all it was free, it's came with my Computer Music magazine (£6.25 as you wish), the fx section is locked in this version, but it's as powerful as
Sylenth1... Basically it's good for everything like Massive.
I really like the unison voice solo, sounds stupid, I know but definitely unique to this synth... There are some hidden features, like oscillator phase, which is important for edgy and bass sounds... It's worth to check the modulation section's targets, some params are not on the front panel...
Access Virus Ti2 - Lot of people think this is too expensive... Which is true, but this is my audio interface (...better than some expensive soundcards), midi controller and hardware synth at the same time. It requires a special workflow (more on this
here). But I found the virus workflow much more achievement centric... The
TI Snow version is much cheaper, it's not rare for £400-500 on e-bay... And this synth is a good standard, just few biggies how using it:
Electric Universe,
Space Tribe,
E-Clip,
Astrix. But it's not the holy grail, you need to know how to work with the sound on this as well.
xfer Serum is like Massive, the only difference is that you can build your custom wavetables, and it also has a built in efx rack which is better than massive, and you need to hear it, but in my opinion it sounds cleaner... If you already own massive it's not your priority, only if you clearly unsatisfied with massive's sound engine.
On the other hand, I think you have more than good enough synths on your list... I would rather focus on the efx section, nice delays, good reverbs, transient shapers, different distortions, wide range of compressors, different eqs etc. Basically the post processing. I found that most of the sounds can be derived form the 3-4 basic waveforms (saw-square-sine-triangle), it depends on how you shape it. It doesn't really count what's the source, you just need to know how you should shape it for the desired outcome.
You can create really nice sounds with nearly any DAW's built in instruments as well (Just have a look Tom Cosm's early tutorials... or the
Pyramid - Elite Session with Mumbali ). First you need to know what would you like to do, and how to build those up with your synths... It's much more experimental. Listen to your favourites, try to find the essence in their track, build it in your own way. After a while it turns out what works best for you... There's no such a thing like good synth for psytrance, you shape the sounds psychedelic... But check this, here's few ideas:
http://tutorials.psilocybian.com/free-stuff/ , try to create these with your own synths. It helps you understand more synthesis.
I hope it's been helpful...
