Eheim are pricier because they tend to be better built, they have a great reputation. With the exception of the Eheim Eccos (these aren't bad at all, just that they are more expensive than the competition because of the Eheim name, rather than build quality).
But pretty much all the filters you mentioned are good options.
Some people will swear by a certain brand and condemn another, but IMO as long as you look after them properly. Just look at the features each offers (pretty much all the same), decide which one suits you best, or just go for whatevers the cheapest available to you.
That goes for the big brand names (like the ones you mentioned), watch out for cheap value brands like Jebo, Resun and the like. You generally get what you pay for.
Things to consider are flowrate and media layout.
What's best for you will depend on the price different filters are available to you at.
For example, I use Fluvals.
For a 300litre tank the Fluval 305 is £10 cheaper than a Rena XP2 and has a bigger overall media volume, the downside to it is that the media is less flexible, half of it is sponge - great for mechanical filtration but not as good for biological filtration. Great for me, as my tanks are full of plants, which pretty much sort the ammonia out for me, and I need to filter out dead plants leaves and mulm. But if you are going for a heavily stocked tank with no plants, the XP2 would be a better choice since you could fill it with better biological media like ceramic rings (though you would have to buy more of these separately), so it would cost even more.
The equivalent Eheims were almost twice the price and had less flow rate, so not an option with my budget.
The Tetratec (Marineland in the US) ex1200 was more expensive than Rena/Fluval of them and wasn't available at my LFS at the time anyway, so not an option either.
They are all reliable as long as you maintain them properly (lubricate all o-rings and check/clean impeller regularly).
