For quality Straps in a variety of styles, Levy's is the go to manufacturer. They have everything from glitzy to basic black utilitarian. I've been using a 3 1/2" wide black Levy's strap for six years with no visible signs of wear, and I have a cool retro-looking strap with a sliding pad that's perfect for my Hofner Icon bass. Figure on spending anywhere from $40-$60 for leather.
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"Bass is the foundation of the band." -- William Murderface, Dethklok bassist
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Lakland 55-94; Lakland Skyline Joe Osborn 5; Hofner Icon; OLP Tony Levin Signature 5 String; Stagg EUB; Genz-Genz Shuttle 6.0; Line 6 Lowdown Studio 110; Radial Bassbone