I think to start if you gave uis a budget range we could assist a bit more. There are varying levels of components within each brand. With an approximate budget we could recommend some full builds. If you are looking new, for a trail/all mountain fully, you are looking at $2K min and likely more. You can find very good deals on prior year models at bike shops (can get to 30-40% discount). Let us know and I am sure we can make some suggestions.
Also the best thing to do when bike buying is head to a local shop and test ride a few different bikes to see what fit feels right for you. Different brands fit differently. Most of all, have fun! It is exciting to get a new bike.