I also used Swype religously for a long time on my old Android phone. But when I got the Galaxy Nexus I decided to see what else is out there. Given that Swype is amazing I only tried swype style keyboards since going back to tap typing felt like using a hammer and chisel.
I found touchpal to be very good. And the fact that it was free was a bonus.
The one I chose eventually (which to this day is still the only paid app on my phone) is SlideIT. This is as good as Swype with just a few minor improvements (i.e. the ease of adding and deleting to and from the user dictionary). The advantage this had over touchpal was that it had a lot of the punctuation keys in similar locations to swype and therefore something I was more familiar with.
After reading this yesterday (I know its old but I was looking to try a new keyboard) I downloaded the 15 day trial of SlideIT and so far I really like it.
Its almost (if not as) good at reading my gestures as Swype, has an option for arrow keys and themes like Swiftkey and the predictions are pretty good (maybe not quite Swiftkey level but close enough). It's basically all the things I like about Swype and Swiftkey in one keyboard, with some extras thrown in. I'll probably end up buying it, but I'm going to make use of the trial period to be absolutely sure.
As far as the others I've tried (all on the GNex).
Stock keyboard: got a lot better in 4.2.2 with gesture typing, but there's no option to long press for numbers or common symbols, you have to switch layers. I found it read my gestures better than Swiftkey flow but not as good as Swype, or SlideIT.
Swype: the best at reading my swipes (may vary by person), I got pretty fast with it. Only things I didn't like were there's no period button when you switch to the numbers layer, and I didn't like the orange trail color (not a huge deal but I prefer the blue).
Swiftkey 3: this was my favorite tap type keyboard, and still is. I gave flow a try through the testing phases but it just wasn't reading my gestures as accurately as Swype (or stock or SlideIT). I liked the arrow keys, being able to choose themes, and the number layer was better than Swype, but I'm too used to gesture typing now and it doesn't stack up there.
I'll probably switch back to the stock keyboard on my Nexus 7 to save space though (I got the 8GB so every little bit counts).