It's really tough to say who I'd rather the Spurs avoid in the playoffs. Every team presents its own set of unique challenges and no matchup this year will be easy. I guess if I had to rank the Western foes from what I perceive as toughest matchup to most winnable for San Antonio I'd probably rank it like this
Least favorable matchups to best IMO.....
Hornets (Byron's a pretty darn good playoff coach and the Hornets are stacked with athleticism)
Suns (The Suns will be a war for us with Shaq)
Jazz (Sloan's a great 7 game series coach and the Jazz are playoff tested now)
Warriors (They can elevate to an amazing level as we've seen in first round matchups)
Nuggets (So much talent on this team and they can bang inside)
Lakers (Kobe always makes playing these guys scary)
Rockets (They've got a bench that plays with great fire and energy. RA is a good coach, but missing Yao should be their undoing in the post season.)
Mavs (Kidd is a great guard but without (or a healthy Dirk) they're susceptible this year.)
My thought while typing that is anyone who wins the West this year will deserve it. The conference is so close from 1 through 9.