These cheap Curtis frames at CRC (£184).

http://www.chainreactioncycles.com/Models.aspx?ModelID=51808

(geometry at bottom of page)

have a 69 degree head angle and 70 degree seat.

the seat seems different to inbreds and souls etc which seem to be at about 73.

what effect will those few degrees have?

none really, as long as you remember the top-tube C-C measurement will be measured from a slightly further forward point adding to the front-centre length. +/-2deg in seat tube can easily be compensated for with seat rail position and seatpost clamp offset

that’s good ‘cos I just bought one 🙂