So what I was wondering, are SSD's that good, and which ones is good performance and price wise?
Or is it more beneficial/reliable to get a fast internal HDD instead of an SSD?
Yes, they're that good. A Samsung 840 Evo, for example, will get up to 500MB/s for sequential reads, vs a very high end HDD which can get maybe
250MB/s. The only real question is whether you're willing to pay for that speed. A 500GB hard disk will set you back about £30, whereas a 500GB SSD will set you back around £200.
If you've got the cash to spend, and huge space isn't a requirement, an SSD is definitely a good investment for better performance. I install some of my games (and my OS) on my SSD, and the performance increase when loading things (jumping between levels, for example) is very noticable. Load times in Dishonored, for example, are about 2-5 seconds. I can also get Windows 8.1 to boot in about 10 seconds, and Linux to boot in about 12.
Also, don't concern yourself with reliability of SSDs. The general reliability of an SSD is equal to, if not better than, the reliability of an equivalent HDD
. Both SSDs and HDDs have bad batches, so of course there's no guarantee that an SSD (or even a HDD) will last you 5 years, but most will.
With regard to which SSD to get, the choice is yours. I picked a Samsung 840 EVO 250GB for my build, very pleased with it, and the price/performance ratio is very good.