Is the PS4 worth buying now?
To me it's always been worth buying. I bought it at launch and now have two of them (as my son tended to take over the other one!). I also have an XB1 (which gets a lot of use) and a Wii U (which doesn't get much use now). I've still got a PS3 kicking about with 100's of games on it, but it hasn't really been played since the PS4 came out. Gaming PCs are great and you can get a decent gaming machine for around £500, which will comfortably beat the consoles. I must admit though, whilst I can easily afford PC gaming (I'm actually in the process of buying a £2k+ top end iMac, which will play games if required), I do really like the PS4 and XB1 as all round gaming and media devices.
If you look at the graphic comparison of FO4 on the PC, PS4 and XB1, then there's little in it. Sure you can get a nice stable 60fps on the PC, but for the large part, playing on a TV, you will not notice the difference playing the 30fps PS4 version. There are some framerate dips in battles, but this is largely felt to be due to optimisation as the XB1 version (which generally doesn't run quite as well as the PS4 version) has had these sequences better optimised.
If you want to play say FO4 at 4k with all the bells and whistles and a 60fps stable frame rate, then you will need a pretty decent PC to be fair. If you buy a £400-£500 PC, then you will get slightly better performance than the consoles, but it's not like you will say, wow, this is like playing a different game. In general gameplay, you won't really notice the difference between the two versions.
..and what should I get as well?
I wouldn't really bother with the camera. I got one at launch and haven't really used it. I don't even have it connected anymore. I'd get at least another pad if you are wanting local multiplayer and I would upgrade the HDD to a 2tb one (only costs about £60). I've upgraded both of mine and it means that I just don't run out of space and can have loads of games installed.
I presume you have PS+, but if not, then buy that as well. Shopto have a good deal at the moment where you buy it for £30 and get a £5 PSN voucher free as well.
Next year we have Playstation VR releasing, which should be great. I also bought a PSTV and whilst this works quite well via homeplugs, it doesn't really get used now.
Hope that helps.