People who are saying SSHDs are the best thing ever should think again. The speed of the drive is more important than HDD vs SSHD. 7200rpm HDD is better or the same as 7200rpm SSHD. The only thing that will be faster is boot up times. I'd recommend this 7200rpm 1tb HDD because it is quiet and has a 32mb buffer:
HITACHI 0J22423 Travelstar 7K1000 1TB 2.5 inch Hard Drive - SATA 6Gb/s 7200rpm 32MB Buffer
http://www.amazon.co.uk/dp/B00B4QESVQ/
Obviously if you can afford it, SSDs are the best.