Internet Explorer 6 (or better), and Silverlight installed should work fine,
but i guess i'm also not particulair a fan of M$ IE for that matter, and since my "need" for sip-switching, isn't that high, i stopped using Sipsorcery,
i just had grips on the Mysipswitch software..... and while i just need something that does it's job..... i had no urge to start over again, with previos efforts....
You must also choose for yourself, if you want to run the SS software of a "cloud", (like SS now is) if the 24/7 functioning of it, is that important to you, you shouldn't..... a cloud is a good option for a NetBook, or other smart devices, with little storage capacity.
The SS service is free to use, (or not) the great thing is, you get a lot of experience using it, at no cost, by using some inspiration and some transpiration
For what i need, i have enough using my 301 D, which has place for 6 different accounts, just simple straight dialplans, nothing fancy, but it works, no looking after for.
btw. i guess you're using Linux most of the time, Which distro ?
I'm thinking of Linux Mint, Fedora, or Suse, besides Internet i also like to
do things with video, like authoring to DVD or converting/capturing Video/Audio
(i'm now playing with gOS on a Asus 701 4G)