I bought a new laptop last Christmas. A Lenovo Z500, Core i5, 8GB RAM, backlit keyboard, 1TB 5400rpm HDD. Performance was worse than my 4 year old Samsung R580 with half the RAM. After nearly 12 months of thinking this thing is rubbish, I decided the HDD was the bottleneck so took the plunge and 2 weeks ago ordered a Samsung Evo 840 120GB drive (£44 on Amazon) and a HDD caddy to replace the DVDR drive so I could keep the 1TB for file storage and forego the rarely used DVD drive. I rigged the Evo drive up with an old HDD to USB kit I bought a few years ago and used the proprietary Samsung cloning software to clone the HDD windows partition to the SSD, which took about 50 minutes.
Fitting the SSD was a nightmare, but only because the Lenovo requires you to take the thing completely apart to get to the HDD cage as it has no service hatches. The whole tear down and rebuild (including the DVD removal and replacement with the HDD in the caddy) took about 2 hours, but now I've done it once I could probably do it again in about 45 minutes I reckon.
Win8.1 now boots from cold to a login in about 5 seconds. From login to a usable desktop in about 7 seconds. Apps open like lightning. I've tuned up the settings (turned off the pagefile (shouldnt need one with 8GB on board)) to limit rewrites to the SSD, and the whole thing just whizzes along. Not yet found anything that doesnt seem to open or load in the blink of an eye.
Anyway, I'd recommend the OP just goes for it. The performance boost will blow you away.