DD-WRT is a firmware, it provides features that are not existing in the original Router's firmware and work more stable than some original firmwares.
However, it does not change the hardware.
There is choices of Wireless Routers starting at $30 all the way to $200 that are DD-WRT compatible
Which one to buy depends mainly on how you are going to use the Wireless part of the Router, that aspect has very little to do with DD-WRT
Given the above the choice of a DD-WRT flashable Router depends on you Wireless needs.
Quote:
1. VPN is a must
2. Gigabit switch
3. fast wireless N service, hoping for dual band radios
4. the usual port forwarding services
End of Quote
VPN is just a matter to getting a Router that its memory is big enough to support the DD-WRT firmware with VPN.
Giga byte switch, and port forwarding services, are not choosing factors at all.
Good Wireless means -
Simultaneous Dual band Router (otherwise you can stay with good 802.11gb).
This is an example for a modest price solution.
http://www.newegg.com/Product/Produc...-333-_-Product
If need Giga ports you add to it this.
8 Ports -
http://www.newegg.com/Product/Produc...82E16833156251
5 Ports -
http://www.newegg.com/Product/Produc...82E16833156250
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If you
do not care about Simultaneous Dual band, and you want your Giga switch in the same plastic box, this is a good choice (yeah Giga ports are just a matter of plastic box and has nothing to do with the Router per-se).
http://www.newegg.com/Product/Produc...-038-_-Product