The best replacement for g13 is n52.

The best alternatives to g13 are rated as following:
★★★★★  n52
★★★★  orbweaver
★★★★  n52te
★★★★  nostromo
★★★  tartarus
★★★  razer nostromo
★★  razer orbweaver
★★  g12
★★  belkin n52te
★  belkin

Your alternative for g13 is not listed? Suggest!
Speaking about g13, one probably shouldn't forget about g12.

Other search terms related to g13 and their ratings are:
★★★★★ g12
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g13
n52
orbweaver