When I upgraded mine I used a Crucial SSD. HERE's the link which also shows precisely where I positioned it piggy-backed onto the optical drive, which ensures there's no interference with the fan.
Unless you've recently done so, once inside the iMac I would also highly recommend that you remove the heat-sink, clean and re-apply thermal paste to the CPU.
On refitment also re-apply paste to both ends of the heatsink prior to reinstallation of the bottom housing.
There's also a useful link HERE, which details a 2mm thermal pad added to aid heat dissipation from the GPU.
After the SSD upgrade, I didn't notice a major change in boot time, although there was significant improvement in opening applications, giving a more slick feel to the iMac's operation in general. Well worth the efforts!
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