Ther eis no issue about not having onboard video, except the money you save by not getting it. The SN45G is cheaper than the SN41G2 for the reason.
Like Yahoolian said, if you are gaming, i.e serious gaming then will will need onboard video. If you just want one for school, office or watching tv, then the SN41G2 willl do all this with its onboard video and it also has integrated TV. I personally like the SN41G2, but then I never game on my home system, I do all that at the cafe.