My favourites are blue, black and white.....funny as I have a red MK2.
Just so happened that in my budget within the used market I could get a red or black Leon so it became about finding one on decent condition.
I don't know how long you plan on keeping the MK3 but my MK2 is coming up to 13 years old so I can comment on what it's like dealing with 13 year old red paint.
Getting the paint to match...near impossible...I have different shades of red on my car and it drives me mad. Swirls...faded paint etc.... Yeah this is a common
problem on red cars...let's just say I spend a lot of time on paint correction and maintaining waxing. When its clean and shiny...looks awesome but once left for a bit...becomes very flat looking.
On one hand it's rewarding maintaining red paint, standing back after its been waxed is satisfying. On the other, it's never ending lol.