Lowepro Flipside 300?

Good evening,

Ive been considering buying myself a new bag for my 7D and couple of lens. Thinking about a flipside 200/300.

Seen this on ebay:

http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=200498611951&ru=http%3A%2F%2Fshop.ebay.co.uk%3A80%2F%3F_from%3DR40%26_trksid%3Dp4712.m570.l1313%26_nkw%3D200498611951%26_sacat%3DSee-All-Categories%26_fvi%3D1&_rdc=1

Is the 200 too small and should i opt for the bigger 300? Any tips would be appreciated.

Thanks,
--
Chris