I'm fairly new to the atv world but have some limited knowledge. I bought my 6 year old an atv and now it's my turn to get one. I will be riding with him on beginer trails but also with friend on intermediate and advanced trails,mostly xc trails but some open areas. My two choices are an 07 400 ex and an 04 & 05 450r. All three are for sale in my area. I know that the 400ex is more than capable but something keeps telling me I should strongly consider the 450r for the enhanced performance, something I've always been a fan of. I know the ex has electric start/reverse while the 450s that I'm looking at are kick start no reverse. Looking for help from anyone with experience with both models and any advice to help with the decision. Looking to purchase asap before the three I'm looking at are sold. Thanks in advance for any help.