Transatlantic Ethernet suggestions (London - Toronto)

Hi, I'm in the process of building a new network, and have a requirement for an ethernet link between London (Telehouse, Redbus Sovereign, or Interxion), and Telehouse Canada (151 Front St, Toronto). I'm looking for either a 10M link, or (if the price is good) fractional 100M (e.g. 30M). I've already got pricing from Hibernia (EoTDM), and Cogent (EoMPLS), but does anyone have any recommendations for who else should be able to provide this? Does anyone have any experiences (good or bad) of Cogent's transatlantic ethernet services that they could share with me off-list? Many thanks, Simon