The average price of the BlackBerry Z10 smartphone on 4G contracts has been gradually falling down and you can now get one from 4GEE for £31 per month from BuyMobilePhones, that's a total cost of ownership of £744. The phone itself costs around £400 on PAYG/SIM Free, which means that the equivalent SIM free cost of the plan is roughly around £15.
As for all EE packages you get unlimited minutes and unlimited texts (plus a number of other goodies like Tethering and VoIP). The data allowance though is fairly small though at only 500MB but then, nobody is offering 4G at the moment so things might change in a near future.
As for the BlackBerry Z10, it is currently the top of the range smartphone at the Canadian company together with the Q10, its keyboard-equipped alter ego. It is a 4G compatible handset, runs the new BB10 OS (now available in 10.1 flavours), has a 4.2in display with a 1,280 x 768 pixel resolution, a dual-core Qualcomm Snapdragon MSM8960A system-on-chip clocked at 1.5GHz, 2GB of RAM, 16GB onboard storage, an 8-megapixel rear camera plus all the freebies one can expect from Blackberry like BBM video with screen share.
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