If you are wanting a good solid bike at the price i would go for the sherco as they are great bikes, they are selling like hot cakes over in Northern Ireland. The vertigo is a great bike, i test rode one in the leadmines but the problem I have is the price as well, £5750 is a lot of money. The sherco 300 is £5200 so you are saving money. I would advise not going for the ossa as they have been bought over and parts are starting to get difficult to get, at least over here. There are only about 5 ossa's in Northern Ireland. The trs in my opinion is unproven compared to the sherco. The trs looks good but i would personaly wait a while till they get more popular. But the only problems with the sherco is the radiator when trying to fill it up and the clutch seems to be easy to knock out.I am going through the same problem, I can,t decide which bike to go for, the sherco 300 or a montesa cota or repsol. The best thing would be to try and get a test ride on all of them.