Kobo is to release on 1 June the Kobo Glo HD, offering "the highest resolution screen available on the market and at the lowest price". In fact, the Kobo Glo HD has the same spec, 300 ppi, as the Kindle Voyage, but will be priced at £109.99 – the current Kindle Voyage price is £169. Kobo's device will be available in the UK from 1 June. It will be available in Canada, the US, Australia, and New Zealand from 1 May.
The Glo HD also matches the Voyage's processor (1GHz) and memory (4GB), and it weighs the same (180g).
(For information only – I have no connection with Kobo – Derek)