If radicals handbook is allowed, consider being a darkholder void born. It gives you +5 WP and +5 Toughness, But -5 Int and -5Fellowship. Penalties to two unimportant stats and boni to two important stats, especially since increasing your toughness by 5 would get you TB4.
Also, if Inquisitors handbook is allowed consider grabbing the Living nightmare background trait with your starting experience, which should be 400 unless your DM is deliberately playing a low level campaign, if not, simply increasing your WP by +5 is a good bet if you go darkholder, since you will then have a Will Power Bonus of 5, giving you much better casting.
Last but not least, consider the power distort vision, since it manifests as a free action you can run around and do a lot of other stuff while potentially stealing actions from your opponents and surviving yourself. Also if Disciples of the dark gods is allowed, consider grabbing the Suggestion and Space slip powers, both are Immensely versatile. Endure flames is also pretty useful since being lit on fire in Dark heresy is pretty certain death (First you have to pass a WP test, then a Hard Agi test to put it out, if not you get a point of fatigue, which means, in 4 rounds you are dead), also many daemons and psychic powers rely on flame, which endure flames make you immune to, the resistance to melta and plasma is sort of situational, but a nice Icing (and if you are facing plasma or melta weapons, the rest of your party is dead anyway).
Also, how did you get an Agi of 20? Void born get 20+2d10. So the lowest you can get is 22. You also seem to have forgotten to add 3d6 years to your starting age, which the sanctioning adds.
Oh and you haven't rolled for what happened during your sanctioning, some of those abilities are decent, so if your DM allows you to choose, grab the one that gives you extra WP or fate Points. My current dark heresy psyker picked willpower increase and living nightmare for starting, so he ended up starting with a WP of 54.
If I had to do it again, I'd probably be able to get him to something like 62 WP at starting out, but that is because I rolled a sickly high score for WP.
For equipment I grabbed a load of firebombs, while my strength is terrible, a grenade can often solve problems, I also grabbed a laspistol, and bought a Hot shot charge for it, so I could do damage when I needed to, I chose a telescopic sight, but I think the red-dot laser sight is better, especially if your DM allows you to relocate it later. I'm at rank 3 right now, so I'm changing my laspistol with a Long las, due to the errata to accurate that is a fairly powerful weapon for a fairly minimal investment (I can hit with BS of 66 by aiming and using a Red-dot Laser sight dealing 3d10+3 damage if I succeed with 2 or more degrees).
Hope this helps