Which cassette?

Looks like I mightneed a new cassette.
If so should I:
Get another LX
Get an XT
or an SRAM PC950/970?
And WHY?
Also what advantages are there of getting an 11-32 over an 11-34?
In case you need to know:
Just got new chain SRAM PC971
Front rings LX
Rear mech XT (97 version)
If so should I:
Get another LX
Get an XT
or an SRAM PC950/970?
And WHY?
Also what advantages are there of getting an 11-32 over an 11-34?
In case you need to know:
Just got new chain SRAM PC971
Front rings LX
Rear mech XT (97 version)
Stumpjumper FSR 09/10 Pro Carbon, Genesis Vapour CX20 ('17)Carbon, Rose Xeon CW3000 '14, Raleigh R50
http://www.visiontrack.com
http://www.visiontrack.com
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I run LX cranks, PC971 chain, 94 XTR mech and a 970 cassette. Its all smooth, but I'd rather have an XT cassette!
VOODOO CANZO
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11/32 vs 11/34, basically as sonic said, but the 11/32 is lighter still.
Deore crankset, Sram PC971 chain, XT cassette & Sram X9 mech.
After a little discussion the difference in price between them all was not that much. The very nice shop pricematched it to an advert in MBUK.
Got an 11-32 as I never seem to use the top ring anyway.
Thanks for the help.
http://www.visiontrack.com