Extended range for laptop w wireless G

Application: Wireless G in the park across the street.
Current config: Linksys WRT54G router/access point

I currently get semi-reliable connects to a laptop with built-in
wireless G, but usually limited to 18Mbps with quite a few
disconnects. I've been consideriing:

1: WRE54G which could be plugged in about 20 feet closer, near
the window.
2: WRT54GX (ditch the WRT54G)
3: Belkin Pre-n

I've heard that the WRE54G is difficult to set up and keep running
so I started looking for alternatives. Obviously Belkin's claim that
it runs at 6X can't be true...its max is 108Mbpts with their own card
in the laptop (not sure if I want to spend $200, given that real
802.11n may be months away). But it still seems to get good reviews
on its own merits.

Is it worthwhile to run the Belkin Pre-n as straight wireless-G, or
will I get very little boost over the current setup?

Alternative: Is there a better plugin wireless G card for the
notebook that will extend range?

I just started looking, so I'm not attached to anything. Please
do recommend other brands, models or alternative approaches.

.

Relevant Pages

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    (microsoft.public.windows.server.sbs)
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    (microsoft.public.windows.server.sbs)
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    (microsoft.public.windows.server.sbs)
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    (microsoft.public.windows.server.sbs)