Personally, I feel SiL is best after OaR....anything else breaks the flow.
Only if you're going for emotional impact, but the OP clearly said he wanted to watch the show in chronological order.
I still think In The Beginning is the perfect emotional (and chronological) bridge between the two, but your mileage may vary.
If the OP is going for chronological order, the best one I've been able to cook up so far is the following:
Follow the Lurker's Guide order (posted by Neroon above), placing Thirdspace before Atonement in season four and re-ordering some episodes to make the flow more coherent.
But after Objects at Rest watch:
River of Souls
Legend of the Rangers
Call To Arms
Crusade (many episode orders possible, but my preferred here):
War Zone (01)
The Needs of Earth (11)
Racing the Night (09)
The Memory of War (10)
Visitors from Down the Street (12)
Ruling From the Tomb (06)
Each Night I Dream of Home (13)
The Long Road (02)
The Well of Forever (03)
The Path of Sorrow (04)
Patterns of the Soul (05)
The Rules of the Game (07)
Appearances and Other Deceits (08)
The Lost Tales: Voices in the Dark
In The Beginning
Sleeping in Light (5x22)