Sorry to hear this mate. Most quick cars are stolen for use in robberies or false plates slapped on and used for criminal activities as they are quick a bit tasty for the scum. Normally but not always 4 doors - easier to get in and out quickly hence evo's made great cars for them to take a few years back.
They chanced it and it paid off, unlikely for sneaky scum to come and get keys, but if they do come to find you, then how many of us are in full awake fight mode at 3am against someone who is totally alert, ready and pumped up and to be sure with a weapon and very likely no too scared of some violent interaction - wouldn't be attacking you in your bed in the middle of the night otherwise. So, leave the keys on the upper stairs, if they get that far, they are willing to come all the way so let them go, it is a car, not a child and not worth risking injury or worse.
Beef up locks, get security lighting and have zone alarms fitted and USE THEM! that way if they try to get in they are going to have a harder job and then got to feel rushed and panicked with an alarm going full chat in the dead of night and EVERYONE now awake!! Most will just want to get the f*ck out of there asap. Again, the most determined who still keep going will find the keys at the top of the stairs.
They don't care about CCTV, waste of time, will more likely have you twisted anxiety constantly watching them to see who has been snooping at night or when you arent in. Posts on the drive imo are a waste, if you can put them down in a few seconds every morning, they can. I also think it makes you stick out more.
Be alert when heading home, or leaving the house, and always leave a gap in traffic and not sit wedged in, just in case you need to drive off.
Keep in mind they steal all sorts of cars, so just get what you want, have decent insurance on it, keep the house security tight and if you are unlucky that they try again, it will be harder for them and they will realise you are more alert and a harder target and move on.
Oh, and try not to come onto forums and blast loads of details of your car, especially with reg showing , you never know who is looking at your threads and the info you post across forums can often make it easy to find out about your and your location, what your cat does and doesn't eat etc hahah
Hope you can move on and get it behind you, you have been unlucky but don't let it spoil enjoying the nicer things.