I would say sig lt40 as its a great kit and flyer if money was not a issue but here in blighty you will pay 130 quid to build one (kit, glue then covering). An arf trainer you can get for 60 quid! Having said that I am a builder and understand the need to build so I would suggest if the lt40 cost is to much then look on ebay for a old trainer kit of any make, they come up quite often.