My band is that with an bass guitar, but he's saving up for a stand-up.
Sorry.
Now HERE is my current awesome band idea:
Standard prog set-up (1 guitar, 1 bass [who will hopefully buy a Stick], 1 keyboardist, 1 drummer) plus 2 female singers, playing jazz-inflected indie/prog (a la The Pineapple Thief's good stuff/Broken Social Scene or Spoon's more advanced rockings) with a post-rock song format. Imagine a 10 minute build from a desolate, sparse, jazzy indie thing, through to a moderately heavy solid jazz segment, up through a fuzzed-out metal anthem, down through some acid rock, back down to a few advanced jazz chords and an upright bass solo (like the end of a Bad Plus song).