Agreed Dev. One possible option is the Seagate Momentus XT Hybrid drive
Seagate Momentus 2.5 inch XT ST92505610AS 250GB 7200rpm Internal Hard Drive: Amazon.co.uk: Computers & Accessories It is a hybrid drive and costs (according to Amazon above) £76 ($100-ish?) for 250GB. It has a 4GB SSD built-in onto which it intelligently (and transparently) moves your most used files (e.g. the main win/mac os files, traktor & your traktor nml library files), and keeps everything else (your tunes!) on its normal hard drive. They are available in 250GB, 320GB and 500GB versions. Looking at the reviews, they are slower than dedicated SSDs, but only by a
very small fraction (and far, far quicker than your current drive!). I am getting one of these soon :D For all Traktor users, they seem like the ideal combo of size+speed.
*I think* that you also don't have the hassle of having to ensure the SSD drive is TRIM'd (optimising the drive because SSD's slow down after being used for a while - something which the specs never reflect and they only quote 'new drive' speeds) - I believe that the hybrid drive automagically takes care of all of this.
NOTE: Make sure you are looking at the
Seagate MomentusXT Hybrid, as Seagate also make a
MomentusXT drive that is not a hybrid drive... it's an easy mistake to make, and I even posted a link to the non-hybrid drive when writing this reply! Be careful... read the specs and it should mention in the description about the 4GB SSD built in (as it is it's major selling point!).