Are there any gains to buying a hybrid drive as the second one
or can I just buy a regular hdd?
If you regularly open the same programs or files from the new drive then an hybrid will help (it will cache those, thus speeding up reading those files).
If you just store movies and music on it and do not consistently play the same song then no. In that case it will not help at all.
Also are there specific recommendations to drive models?
That depends on your goal. I got a WD black in a caddy in the (previously) optical bay of my E6500. I bought that based on speed, capacity and price.
Is price and battery life is an issue (or when doing mostly sequential access like playing movies) go for a low RPM green drive.
If price is less of an issue and you think you might access the same programs or games quite often: Go for a Hybryd.
If capacity is not much an issue then consider a second SSD. (240GiB is getting quite affordable).
1This is always debatable. It depends on how much you are willing to spend and what your requirements are. Purely opinion based. I wouldn't flag this question because you already gave your bounty – Prasanna – 2014-09-09T18:45:11.517
I took the liberty of removing your request for specific recommendations, as that is off-topic here at superuser. – ChrisInEdmonton – 2014-09-09T18:48:05.160