Immanuel Kant
Guyer & Wood · 1998
Guyer and Wood's Cambridge translation is the modern standard, and where I'd start for serious study — accurate, with both the 1781 and 1787 editions and extensive apparatus. The Critique is famously hard going in any language; this is the version scholars rely on. This is where I'd start.
Werner S. Pluhar · 1996
Werner Pluhar's Hackett translation is the other serious modern option — some judge his command of Kant's German even finer, and it too gives both editions. A strong alternative to Guyer & Wood.
Norman Kemp Smith · 1929
Norman Kemp Smith's 1929 translation was the standard for generations and is still widely assigned — but it's now considered dated, with real inaccuracies. Fine if it's what your course uses; otherwise the modern translations are better.
J. M. D. Meiklejohn · 1855
J. M. D. Meiklejohn's 19th-century translation is public domain and free. Very dated, and thin on the second-edition material — free, but this is one where the modern versions are worth the money.
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