266mm Are a good set up which are affordable, and you will notice a good differnce from standard saxo brakes, You can pick up a pair from £60.00-£90.00 With discs and pads, Look around local scrap yards, or ebay or on here, With brembos you will have to have spacers im sure, and also you wont require brembos for day to day driving in a saxo 1.1, and 106 gti brakes or vtr/vts wont be that much difference and time you payed for them, you might as well bought 266mm brake set up, i also recommend braided front brake hoses, Pm Swampy for braided brake hoses.
Thanks Mark