Re:Which new belt
If you want 13mm then the Titan Toro belts (single prong) are good from liftinglarge.com. That's what I use for squat and deadlift.
13mm is a thick belt though and if you only small or not needing massive support then a 10-11mm may be better. The APT belts at extremepowerlifting.co.uk are good value for money aswell and everyone seems to like them that's got one.
Good idea to try a 13mm belt and see if it's ok for you is possible.
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2010 Overall BPC/GPC British Powerlifting Champion
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2009 British Champion BPC Mens Open 100kg Class