What's the advantage of separating Modem/Router instead of using Combo

I currently use ADSL modem/router Combo (10/100 ethernet and Wireless-G) and about to upgrade the network connectivity to Gigabit Lan and Wireless-N.

I still doubt about what solution will be better and why ?

1. Buy new "Wireless-N Gigabit Router", use old combo as a modem only.
2. Buy new "Wireless-N Gigabit Router with Modem", discard old combo.

I just want to ask in term of QoS, performance, stability, extensibility.

Could you suggest what solution will be better and why ?

Thank you in advance
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More about what advantage separating modem router combo
  1. option #1 will work fine since there is no DSL connection that is faster than 100 Mb
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