which router should i buy?

AFAIK, the various turbo-G techniques are all proprietary, so you would need the same brand of turbo-G adapter as your router to achieve the benefit. So, your built-in is standard 802.11g.

My advice - don't bother with turbo-G, speedbooster-G or whatever marketing name the vendor gives it.

If you need to transfer a large file or do something else where speed makes a difference, connect a wire.

BTW, the "real" data throughput rate for 802.11g, with a strong signal, low noise, and one client is more like 20-25 Mbps, not 54. 802.11g has a lot of overhead that consumes half the available bandwidth. The same holds true for the 108 claims - divide by 2 for your best case scenario. Both of these are considerably slower than your cat5e wire.

But, both are probably considerably faster than your internet connection.

It'll be: a/b/g (54/11/54). Just like Iceblue already said, you can expect to get nowhere near 54Mbps with a 54g connection. Oh, it'll connect at 54g and say that it's "Excellent", but the throughput is nowhere close. I've tried a few different routers and found the Buffalo High Power (WHR-HP-54G) to be one that can punch holes through walls like no other. Downside: It's throughput is nothing special. I have also tried the new Netgear RangeMax Next Gigabit w/ cardbus card and the D-Link DIR-655 w/ cardbus card. The Netgear would be fast one moment, then slow to a crawl the next. I ended up keeping the D-Link. Going through three walls, it can maintain 6MBps (Mega bytes, no bits) FTP connection from my Gigabit connected Buffalo LinkStation Pro. I'm very impressed with the D-Link and it's only on the second rev of firmware.