Its been a while since I looked so I just did. The t1x that are in stock right now I am seeing them around $500 mark. The ones for $450 seem to be out of stock. Another thing I learnt is that some dealers will show $500 and then say something like add to cart for best deal and that is where you can get it down for around $450.
For learning the mechanics, shot execution and more just about any gun will do that for you. Even a $250 Savage Mark II FVSR should get you mighty close to 1/2" @ 50.
That Annie should be pretty nice but I've seen used 64's go for even less than $850 on the used market so I am not saying its a bad deal by any means but its probably not a fantastic deal that you can't pass up. They are nice and have nice triggers specially if it has the two-stage trigger in it but the single stage is nice too. I think you'd be quite happy with the Annie though.
One that
@Kisssofdeath turned me on to back a couple years ago that you can find for near that price is the Styer Zephyr II (brand new) which is a mighty fine and beautiful gun with really good accuracy. That is if you are a right-handed person. I am a lefty and there is a ridge that runs along the other side of the stock that isn't good for lefties. It can be lightly sanded down though.
Vudoo's are going to run you at least twice as much as the Annie 64's on the used market but I am one that will say that if you can swing the money, I'd sure get one and not look back. When you shoot it, you'd know it was you with the issue and not the gun if the bullets all don't go through a single ragged hole.
Another one I really enjoy if you like autoloaders is the Kidd Supergrade.
There are a number of 22LR rifles on the market now that will guarantee 1/2" @ 50 or MOA @ 50. Don't forget the Bergara. Its next on my list.
I think you only need to decide if you want a premium gun to start out with or something cheap to learn everything and later buy you the really nice one.
If you bought a Vudoo and decided this shooting sport wasn't for you, you could always sell it quickly and for a good price.
I just haven't had great luck with CZ's since they moved to the 455 series. My 452's are great. But there are many of folks that would whole heartedly disagree with me and have had different results. They also have a cult following. I belong to that cult as long as they are 452's.
You have so many choices. Don't forget the Bergara.
Everyone is different and have had different experiences but for me, if I had 8 or 9 hundred dollars to spend, I'd get the Tikka, put a good decent scope on it and go at it. If money wasn't an issue, the first gun I would buy is the Vudoo.
I do like the Annies as well. Currently have a 1761 which is a really fine shooter. Its not quite up to par with my Vudoo though. Any that Styer and Annie are really close in my liking.
I will stop, I can go on forever and you will get some guys on here that are much more adept at giving out some good advice and opinions.
Good luck with your search.