I cant decide whether to buy this horse!!?

Since you have ridden him and have seen first hand what he can do, and how he performs, it sounds like he is perfect for you. You also stated that you have a trainer. He/she should be able to coach you with him so that he stays on track. If you have looked around at other horses and you feel that this is the one for you, better grab him before someone else does. There have been times when I have waited too long and ended up being on the short end. He sounds like your dream horse, and if you really want him, buy him if you think this is the one for you. Best of luck to you.