Well the speedbooster helps with 35% faster throughput over the 54Mbps, if you have a wireless card with speedbooster, that is. Other advantages is that this model has twice the ram and rom sizes over the normal version. So that version should be better suited for heavy network traffic. I read reviews about those two options and people were complaning about disconnections with the option #1 and not #2. I also found the #2 model going for 125$ @ compusmart.ca instead of 150$ at futureshop.ca (they both offer 15$ mail in rebate).
So I'll go with the Linksys Wireless-G 54Mbps w/SpeedBooster 4-Prt Router 10/100 mentionned above.
I hope that my monolog was helpful to somebody