I've been producing progressive house / DnB using software synths like Massive and Sylenth1 and have learnt how to get the sound I want reasonably well now. I like the unison functions in both these synths and the 3+ oscillators.

Separately I play bass in a band and was thinking of playing synth as well. I have a 61 key midi keyboard & keyboard amp, and my first idea was to use an ipad with camera connector to keyboard and the Sunrizer app (which I love) to play. Unfortunately it doesnt seem like a reliable setup as audio seems to drop out when i close and re open the app and have had some problems with the mini jack cable slipping out.

Was wondering if the solution to this is to get a hardware synth, but I have no idea if I'm expecting too much for the amount I would be able to spend. I would probably need to switch between several patches (guessing you cant do this on true analogue ones) and would like a large number of oscillators preferably through unison or some kind of supersaw function. How much would it cost to get something like this second hand, and can anyone recommend anything? I would like a realistic idea of what i would need to spend to get something that sounds decent so say if my budget is too low but I probably couldnt spend more than £250 max (student) and I would prefer cheaper. Is there anything available at this price point?

Thanks