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Doh, sorry, missed the fixed hub bit.
Edited to add: On my singlespeed wheelset I replaced the front Mack hub (which failed spectacularly and catastrophically) with a RAF12. The rear Mack hub (a Superlight low flange version) has worked fine and looks very similar to the RAF12. Not the same manufacturer, but you'd need to be eagle-eyed to spot that, so that might be an option. Bitex do make track hubs, but they're of the traditional high flange, waisted hub variety and wouldn't match any of their geared rear hubs, so you couldn't have a front hub which would match both.
Novatec would be the obvious alternative, but my experiences of Bitex have been positive to date. Like the Novatec hubs they just tend to work, but the bearings fitted as standard can be a bit short-lived. The Bitex RAR9/RAF10 is the classis budget weight-weeny combo, but unless you really want to save the grams I recommend going for a RAR12 front hub instead. The bearings on the RAF10 really are tiny, whereas the RAF12 uses 6900 bearings. You could also go for the slightly heavier RAR12 rear, which has two of its bearings in a larger size than the RAR9, but I've found the RAR9 pretty durable.
I've got one wheelset with Light Bicycle rims using BX312F and BX312R hubs on my Lynskey and I really like them. They're for straight pull spokes though. The BX106F/R hubs would look closer to the RAF/RAR rims brake hubs, assuming you're using centrelock discs.