Might be worth saying if you want 3 door (SC), 5 door or estate (ST) and manual or DSG? plus as above the year or a budget. IMO they come well specced as standard so I never bothered with any extras. Winter pack if you want heated seats, SEAT sound if you like music and want a better sound! If you're buying used then you've got limited choice as a lot of cars don't have that many options when I looked. The later cars get bigger Nav screens, get 2018 on and you'll get the digital cockpit which is nice but not essential IMO. Also colour can determine things as some colours where not available for long or only from certain years, my personal favourite is Alor blue but it got discontinued so when I ordered only Mystery Blue was available which I like. Desire red is lovely IMO but only came on later cars, 300's I think?