A blasting wilder can reliably dish out moderate amounts of damage for really low pp costs. You only need 1 point, a focus, and the 15% chance of further cost to deal 2d6 (1st lvl), 4d6 (3rd), 6d6 (7th). Inevitable strike is my first choice because it makes standard cast + free action blast shot nearly impossible to miss, or regain focus + swift cast + free action blast easy enough to land. They play like a warlock focused only on damage. Modified blast gives options like eldritch shape, powers work like other invocations, and the costs are relatively low after a few levels.
They can also dump 4 more points into it to increase the damage by 50% with modifed blast. At 4th level, you could spend 1 points on inevitable strike, 4 points on modified blast to do ~6d6 force damage with almost no chance of failure.
The damage type is amazing and it trivializes many defensive options. A force supernatural touch attack with inevitable strike overcomes all forms of damage reduction, energy resistance, concealment, incorporeal miss chance, physical armor, and enormous amounts of touch AC with cover and firing into melee penalties. Modified blast lets you deal with swarms. Ghosts and golems don't stand a chance. That leaves hardness and regeneration to slow down the damage (unless you have elemental blast!)
The downsides are provoking lots of attacks of opportunities from ranged attacking, casting, and focusing; limited range of 60ft with extended blast feat; uneven scaling; and slow refocusing lower levels.
They have inconsistent damage each level. The first few levels are bumpy because you spend half of your time refocusing. And then they only get +2d6 every 4 levels after 3rd. Surge crystals can help them pump up their damage between those 4th levels, which makes craft wondrous items an attractive choice.
I think that the double-focus cost is a mistake. There was a DSP forum post on 7/2013 where Jeremy Smith ok'd a single focus description of blasting wilders: http://dreamscarredpress.com/dragonfly/ForumsPro/viewtopic/p=34558.html
Edit: also check the link for a good hustle combo
Student's surge is the best, IMO. Psycrystal is important, extra powers is great, and the enervation is minor. I just wish they had a psionic body option instead.
For feats, I'd go with extended blast at 1st + psicrystal affinity from student's surge + situational for humans, situational 2nd, psycrystal containment 5th, situational 7th, expanded knowledge(hustle) 9th student surge.
For the situational I'd take elemental blast if you have an ally that can convey weaknesses, enervation fortitude for longer adventuring days, craft wondrous items when you have cash (+1 surge crystal is 7.5k to craft), surging aura for helping you and your allies hit, Psionic body if you're feeling squishy (+6, 8, 10, 10, 14, 16hp at each of the first 6 levels and up to 36 at 20 with human/psionic race).
For powers, I'd pick inevitable strike (necessary for lower levels, but touch AC doesn't scale well), offensive prescience(small boost to damage early on) or entangling debris(a nice debuff) or any of the many defensive powers, defy gravity (stay away from swords), concussive onslaught (long range, sustained, AoE), fold space(positioning and dealing with longer ranges), slips the bonds(defensive buff), pierce the veils(utility buff). Psychic reformation is abusable, so choose with caution.
Races, halfing is nice in the beginning for dex/size on attacks and ac, bonus on saves, and charisma. They don't have much for favored class bonuses. Humans are good for picking something other than +2pp and they can net a few extra powers with favored class bonus. Elans also have the bonus powers, but they are stuck with 2pp at level 1. Their racial immediate powers are decent for an emergency, but they eat up your swift action.
Items: Surge crystal is essential, circlet of sheltered mind for less enervation, charisma headband is nice for AoE saves but power points aren't that rare at higher levels, power stones/scrolls/staves/etc for problem solving, misc defensive items like armor and shields