Hello Artlayton,
In your case, I would actually recommend a wireless N router and probably just stick with G adapters for your pooters. The N protocol is still compatible with G. 150 feet indoors is quite a distance for wireless. You would probably be best off with the expanded range of the 802.11N series routers. It doubles the average indoor distance.
Keeping your adapters as G adapters will save you a bit of $$, but you may still want to get N adapters to have an even better connection. If you stay with G adapters, you will still benefit by having additional range. I wouldn't be so concerned with the transfer rate because you will only really notice a difference if you send massive quantities of data across your home network. You won't see the difference while surfing the interwebs.
Here is a good link that might interest you -
IEEE 802.11 - Wikipedia, the free encyclopedia
I would recommend the Linksys WRT300N model. It is about 130 bucks retail.
If you must stick with the G format, I would go with range booster cause again, you won't see a difference while surfing if you get one with a higher transfer rate, only if you send large amounts of data across your home network.
Hope that helps!
