Leon Cupra Purchase

Moin people! My buddy wants to buy a Leon Cupra at the beginning of 2016. How exactly this one should be equipped is still the question. What is a must and what can you do without it? Don’t know me at Seat yet, but Black Line 19″ he probably wants to take the 6.5″ Navi, parking aid front and rear, grey metallic as color, 5-door, Seat Sound System (how good is that really, 150 watts or how much has that?). Audi and VW have a lot better music systems to order in the car. I is the price of 26.200 € appropriate for an EU new car? Is an EU new car generally recommended by Seat or rather advised not to? Greetings Adistric