I have a hosta, Frances Williams, I bought from the supermarket last year for $2.00. It emerged this year as an entirely different plant - bigger, grander & more fabulous than ever. You have a nice collection. I don't worry too much about the name as you say, many look-a-likes. I'll try to match it as close as possible but won't go crazy over it.

The first hosta pic could be a number of possibilities but it looks a lot like 'Fire And Ice' which is a very popular one of that variegation and leaf shape.

The second pic could be 'Emerald Tiara'.

The 3rd pic could fit dozens of Hostas. Can't see how it's 'Niagra Falls', though. Wrong leaf shape, colour and that has a serrated margin. Possibly 'Oxheart' resembles yours most, but also 'Happy Hearts' and 'Heartleaf' are similar. 'Niagra Falls' looks like pic below..

http://www.perennials.com/plants/hosta-niagara-falls.html

Thanks for your help Bathgate and Bendipa. I'll have a look at your suggestions.

there are 100's of hosta varieties. you would be better sending pictures with measurements/ruler scale to the hosta society for correct id.