That looks great afterwards! I have the same watch (if yours is also a 2298.80), that I bought in 2014 right after the previous owner had it serviced.
With my 80,xxx,xxx serial number mine is probably one of the last to be produced in the early 2000's. The $750 for service is about what Omega is now charging for all chronograph services, in Ti or Steel. The $550 seems awfully steep for the bezel, as I bought a spare NIB Planet Ocean bezel in 2014 for around $300.
[EDIT - just checked and I'd saved the price for a spare bezel at ofrei.com in 2015 which was $512]
After the work done to that Ti model, it's worth about $3K or more, but you certainly should keep it and not flip it to honor your friend that gave it to you. He wont be asking for it back when he knows you now have $1300 tied up in it + the new strap. You could buy a 2000 Seamaster Pro in it's entirety for what you've invested in it.
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