Where do you order parts/chips?, here in Norway it is not so easy, so I ordered an stack of those discovery boards first.. maybe going to use seeed for some pcb's, but getting one-off parts is a bit expensive.. (typically $30 in shipping costs from mouser/digikey etc, and Elfa closed they shop here in Oslo, but, they was too expensive anyway)
As for the STM32F4 chip i was looking for elfa (I'm a swede btw ), and they also has a breakout bordlike for LQFP100 sockets. Then for some cheap stuff like breakout board for micro usb i was looking at http://www.electrokit.com . Shipping by elfa in sweden is practicly nothing so
Going through the Tour d'Horizon pdf right now too.