Mind you, technique will be the main thing. As far as 'glide' is concerned - we are still scrapping a bit of steel across our skin taking wiskers with it so a soap can only go so far making this a smoother process. Good stropping and a well honed blade has a part too.
Once you've used a straight for a long time and your comfortable with your technique you will get smoother shaves and pretty much any soap works. You could (and I have) spend a lot on soaps and still get a rough shave until your technique improves from practice.
As pointed out there are many.
The cheapest B&M soap is Latha (choose your scent) which is great - though the Seville (more expensiver) is their take on a Barbershop. ShaverHeaven is excellent and made locally. There are many scents I'd recommend Arctic Mango (for a peach & menthol hit) - or barbershop for a classic scent.
I'd recommend not buying more than one soap and concentrate on technique for a while.