The Pololu stepper driver is the most used in RepRap electronics, like Sanginololu or RAMPS. It's already assembled so no soldering are required.
Stripboard for prototipation. Short the different traces you obtain a cheap and effective bed heater (like shown here).
Glass thermistor for high temperature. It can be used both for the extruder and for the bed.
- Resistance at 25°C: 100K
- Tolerance: 1%
- Manufacturer: EPCOS
- Max temperature: 300°C