you could also speak to Ian at specialied engines,he did all my headwork.
you can just use cams in the standard head but you'l loose out on torque low down and combined they make the best use of each others merits.

but yeah,its still do-able..
Im using kent 2001 spec cams which are probably the tamest really.
they give around 12-15bhp and dont affect idling or general running.
its still smooth and drivable with this profiles in the head.
you could possibly go one set higher(cant remeber the actual profile of these)and still retain a good idle..it will be slightly lumpy thou atthis point.
and the next stage up again is def not for you as their proper lumpy buggers and not ideal for town driving etc..best left alone unless you have a decent breathing system like throttle bodies to justify such cams.

maybe worth speaking to Burton and asking them if they could re-grind your existing cams for a wilder profile cos that would be cheaper still.