Yes, it will be interesting. Financially, I think Vinnie's contract value becomes more clear as these playoffs go on and the competition level, pressure, and style of game evolves with differing opponents. This will help to calibrate his pricing as a UFA.
Woodcroft gave him an NHL opportunity that Desharnais seized and has continued to build upon. But can't forget he always fought for his contracts with initial minor league deals and hard playing miles through ECHL and AHL competition. Cap Friendly shows him with career earning of $513,000 so this is now about a peak career player with distinguishing characteristics and attributes that include elite size, hard grinding style, right-handedness, a growing and maturing game at NHL level with PK and game close-out deployment. He's going to get paid and common sense suggests at his age that term length will have to be longer. The range I think could be $2 million to $2.5 but maybe $1.8 as you suggest.
Desharnais bet on himself for over a decade and countless leagues and teams going back to minor midget to be in this position of now controlling his financial destiny. Looks as well like there's more latent potential as his game calms with experience.