Hey Brian, Love your stuff man!! In fact you inspired me to make music ;) Could you name some VSTi's good for Synthpop? Thanks.
Right now my main synths are Massive, Sylenth, and Zebra. Everything from Perfect Tears to my DM tribute was done on a single (hardware) synth, the Yamaha An-1x, so don't feel like you need to amass a huge collection!