Good effect processors are expensive.
As you mention you like to have another synth, You might think of a Kurzweil K 2600S.
The built in KDFX can be used as an effectprocessor for external gear (as long as the sample option is installed as this option comes with the inputs needed.)
This way you have more effects as ever dreamed off..
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Keyboards/Sound Units: Kurzweil 2600S, Roland VR-760, Acces Virus C, Roland G-800, Akai AX60, Minimoog, Machine Drum, Roland R8-M, mediastation x-76