I too agree with apinkus, don't change if you don't need the increased throughput or range. If you really need the range, the Belkin is awesome for extended range for existing products. Even with old 11a/b/g products, coverage is doubled what a standard Linksys WRT54G would do. If you use their client, you'll get 40 mbps for close/medium range.
Another solution you might want to consider is the WRT54Gx, which is also Pre-N, but utilizes BG but also increases range.