I'd go with:
PG: Rondo / DJ / Delonte
I like your complete list. I would only make ONE change... I'd take Jerry Sichting over Delonte.
1) durability... Sichting was healthy that season and played a key role as a combo guard off the bench. He played in all 82 games that season, and Delonte simply cannot be counted on.
2) shooting / floor general... Sichting shot an amazing 57% from the field (as a guard, mind you) and also a shade over 92% from the FT line. He averaged 6.5 pts per game to go along with nearly 2.5 assists.
3) toughness... Probably a toss up between he and Delonte, as I like Delonte's desire to mix it up. But sichting was no slouch, and he would often get "feisty" and had a way about him in which he could get up in a guy defensively. Plus, who can forget his fight with Ralph Sampson in game 5 of the series with the Rockets, one which many believe made Sampson fade away in that series, inevitably coming back to Boston for game 6 and getting shelled (and Sampson was invisible).
But again, Sichting would hardly play much with this team, but a guy like him is always needed.