that lp5000S is a re-boxed fujimi enthusiast, and is not for the faint of heart. it is a very detailed kit and takes alot of finesse to build. I wouldn't suggest it for a beginner, or novice. the others are really just typical AMT models, thick bendy plastic that doesn't fit well, globby looking details, and they are quite difficult to get a show winning finish from.
however for a beginner, or novice the AMT kits would be a good way to go. you will learn alot from building a crappy kit.
if you want a decent lamborghini,
this kit though it has it's inacuracies, the monogram Countach is a really good kit with fit and finish. plus, it goes together well and very little problems with assembly. it's full detail with engine and interior, though it's difficult to see. the only drawback to this kit is the wheel size, they scale out to be around 14-15 inches, when they need to be like 16-17. it's a great kit and is quite readily available