Do you have a computer with which you can sequence?
Do you want to play live, or just make studio-based tracks?
When I saw The Postal Service, they played their sequences live with a G4 laptop (running ProTools, I read). I believe the programmer (jimmy, I think) had a Korg chaos pad and a Microkorg (which I think he just used as a controller, cause he was spinning the knobs alot, and the sounds weren't changing). The guitar player had
a Nord Lead 2 and a telecaster through a small blackface Fender. They also had a young lady with them (not the singer from Rilo Kiley) and she had a blue strat, some Roland machine, and a midi drum pad.
So, this is what I'd recommend:
If you want electronic sounding drums- Elektron Machinedrum ($$$),
Novation Drumstation ($$), Nord Lead 2 ($$)
For synths: Nord Lead 2, Alesis Ion,
Casio CZ101/
CZ1000 (this machine will give you sounds you won't find from a FM or Subtractive Synth, with the benefits of both...I think it's great for quirky/80s sounds)
Effects- I think a dedicated hardward filter would suit you well- Electronix
Filter Factory, Sherman Filter Bank, Moogerfooger pedals
- A delay is of utmost importance:
Line 6 DL4, EH
MemoryMan
Good Luck
Chris