Hi I have just built my first lego set it was 21309 and it was amazing. Can you suggest me some really good lego set? I was searching for something space related but I did not found anything except star wars that Im not big fan. I was thinking about sticking with one theme lego sets my favourite themes are harry potter and architecture(but some sets looks really bad in my opinion). Can you suggest me some good lego set? And is it good to stick with one theme legos or it doesnt matter?