54 litre Aqua One Horizon. Nice tank, I have one myself divided for two male bettas. If you don't divide it, it would be an excellent mini-community if you kept a betta with betta friendly species such as corys, shrimp, snails and maybe some endlers or something else small and peaceful. (My favourite tank here)
25 litre Aqua One. Good size. What filter are they selling it with? The internal or the undergravel? I woul try to stick with an internal filter as much easier to maintain. Good size but I would avoid it because it is tall and thin rather than long. Bettas prefer horizontal room to vertical room.
34 litre Aqua One. Again, tall tank but big enough over-all to make up for that. Good little tank but I don't think it comes with a lid. bettas are good jumpers!
Interpet Fishbox, in 48 and 64 litres. Both excellent, in my opinion. Definitely big enough for a betta and a betta-compatible community. I think if you want a betta, you would be best off going for a tank that you are happy to have very few fish in. I'm not keen on keeping them as community fish and many people find it hard to resist buying more and more fish when they have a 40+ litre tank.
20 litre corner tank. Got brought in on my last weekend working there. I don't like the shape but I think it is just about big enough. I think the shape really restricts the spaces they can explore and such, but it's a matter of taste to an extent. No idea about the filtration on that one.
I wouldn't risk it. Very good at tearing fins, those are. P@H don't really sell them, but look for some silk plants if you don't want live.
Couldn't really see the boy in the vid very well. I try to avoid getting fish from P@H - I'd much rather rehome/adopt an unwanted fish than buy one from a shop, especially when it comes to bettas. However, if you like him and he looks healthy, go for it.
How are you planning to cycle the tank?