I am currently working with:
C&D
#517F/R - Virginia Flake / Virginia Ribbon
#525 - Red Virginia (Good straight, smoke carefully)
#525v - Red Virginia Cavendish
#166 - Turkish Izmir
#523L - Cyprus latakia
$169 - Burley White
McClelland
Blended Turkish Ribbon
5105 Stoved Virginia
Blending Orientals (I like the McClelland Blending Orientals a lot, straight or mixed. )
Eastern Carolina Ribbon
Perique - Ribbon Cut
2010 Classic Virginia
5100 Red Cake (on order)
Cyprus Latakia
I'm a big 4Noggins fan and I typically get everything from them. They have the best, most organized selection of blending tobaccos I've found.
Blends:
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Virginia/Oriental
1 part - #517F/R - Virginia Flake / Virginia Ribbon
1 part - #525 - Red Virginia
1 part - 5105 Stoved Virginia
1 part - McC Blending orientals
Sweet and spicy, a current favorite
One variation that is delicious adds 1 part white burley.
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English-type #17 (I do a lot of blending)
10g Solani VA Flake w/Perique
5g McClelland Blending Orientals
Good
10g Latakia
5g 5105 Stoved VA
Nice English
2.5g C&D #525v Red VA Cavendish
A bit sweeter
Pressed in sous vide bag for 4 days.
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Standard English-ish Mix (for me)
10g Virginia Ribbon (C&D #571R)
10g Red Virginia (C&D #525)
or 20g of 2010 Va
--
10g McClelland Blending Orientals
5g Turkish Izmir
10g McC 5105 Stoved VA
15g Latakia
5g C&D #525v Red VA Cavendish
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#5
40% 2010 VA Flake (rubbed out)
40% White Burley (#169) - Prince Albert works well too.
10% Cyprus Latakia
10% Perique
All of these blends change character the longer the ingredients marry. I find that they all need at least a month to 'click' and the English-type are better after at least 2 months. YMMV
I also find that using one of those nifty, zippered Sous Vide bags with the little hand pump helps the process along sometimes.
This is a pretty nice article as well
http://pipesmagazine.com/blog/put-that-in-your-pipe/how-to-adjust-a-blend/#more-4298