I've return to riding my 15-year old trek navigator comfort/hybrid bike and I've lost 30 lbs in the last 5 weeks. I'm looking to transition to a fitness flat bar bike with better rolling tires, gears, and brakes...and hopefully lighter than my 32 lb navigator! I ride 100% on paved trails. Started at 5k rides, and now riding 10-15k 4-5 times a week. I'm considering the trek fX 3 disc. Budget is $600-800. What other bikes should I be considering? I weigh just over 300 lbs but ride 4-5 times a week and I'm looking to keep fitness riding long term. Thank you.