if you are on an 8mb ADSL package and happy with the speed, then i'm sure you'll be delighted if you get the 30mb (which is the XL internet) package as that still runs at a solid 7.5mb if you reach the STM
there is additional p2p/port throttling but that shouldn't bother you for the use you listed. i'm not a p2p fan but the odd times i've used it i've not noticed any throttling but i think it's setup in a way that depends on how much general usage is in your area
i suppose it also depends on area too, but i've hardly had any downtime with VM either