I don't perceive that your remarks are aimed at me particularly, but I think that it's correct to get the bike, as it is, in good and serviceable condition and save upgrade money for a better bike in the future. I'm not saying that the Brava is a bad bike or "low end" or anything else derogatory about it. I think it's a good bike well worth putting time and labor into. I think, for example, some time spent cleaning and polishing the aluminum parts, like the brakes, would be more satisfying than spending money on a new Ultegra brakeset. I think spending money on a couple bottom bracket tools, some solvent, some grease, and maybe some loose balls and then spending the time to learn to use the stuff properly can be a very satisfying, almost cathartic, experience that will improve the bike from it's current condition at least as well as going to a 105 chainset with octalink BB. I don't know, there's something about opening a traditional cup and cone BB, terminating the existence of that crap you find in side, massaging the balls into perfect smoothness and shininess and then replacing them with new grade 25 balls, just because, taking out the fixed cup so you can show your loved ones what a left handed thread looks like and then putting it together with love and attention to detail and ending up with cranks that spin smoother and more true than they did when new. Somebody belittles your cup and cone BB and you can explain that it works better than the sealed bearing ones and that servicing it is a snap if you know what you're doing. you can extoll the virtues and beautiful simplicity of friction shifting. Somebody says it's not dual pivot brakes with the super expensive cable and housing you can smile and tell them the brake job cost $12 including pads and because the wheels are true they work.

If you get one of these things in condition needing service, you can get it into great shape for not much money, end up with a great riding bike, and get more for it than you paid.

Stuff that costs money: some decent bike specific tool to service the headset and bb, a chain tool and a decent chain and freewheel to go with it. Other things that can be as expensive as you want like brake pads, bar tape, pedals. Maybe some expensive stuff like expensive tires and a high quality saddle; stuff that will make a big difference in the riding experience.