ye your wiz is raw int damage character.. dps improvements easily comes from crit and crit damage.. also its not very expensive.. :)
first of all i recommend 1hander + decent source.. now after 1,04 there are many cheap 1handers lets say input in AH options: 100 int, 50 vit (or no vit at all), socket and check for dagger/sword/wand over 800-850 damage.. it should cost around 500k-1m i think, if not lazy refresh AH often and you can find much cheaper weapon :) later input green gem to weapon socket.
about source.. start with damage.. max dmg options is around 100-410, so aim for min-max together 400, or more, and input crit chance 8 and int without number, shouldnt be very expensive.. if it expensive, then get rid of int, and buy just with crit chance 8
next i will go on rings: if you low on budget, go for 3.5-4crit and 70-100 int both ring.. additional options such as vit, min-max damage also are okay :) just refresh ah often, it should cost 50-100k each ring..
later go on amulet, lets say aim for 100int, 7crit.. if those are very cheap, got higher crit or higher int.. also additional options vit, min-max are nice if there are alot of amulets which u can choose..
later i would go on gloves: input options crit 7, critdmg 30, int 70, and vit without number, should cost something like 200-300k, also if there are alot of gloves, check for those which have more crit chance ;)
next i go on bracers: input 4 crit, 50 all res, 70 int, and vit without number.. can be expensive, but i find my own for 120k (check at profile if want)
next helm: its quite nice, but can be changed for lets say 130+ int, 4 crit and maybe socket for amethyst gem, but here i will think, because tal rasha has nice vit bonus and sacrifising so much vit requires to add more on other parts to stay on ~30k hp
other pieces: chest armor, belt, pants, boots are more defensive parts and not improving dps much, only raw inteligence..
but here you can think about what way you go on your wizard: melee or glass canon, if melee which is popular nowadays, go less int on whole parts and add all resistance, each part 40-60 (depends on budget), also boots i highly recomend to have 10-12 movement speed :), all pieces parts (those defensive ones) input options it have.. if prices are low (with all res of course), just add more int until u can't afford price you see on ah:)
so if you are low on money, i would go my way starting from weapon 1hand and then source ;)
also check your build, for me its crap one.. you standing while hitting with disintegrate, which not okay for guy without resistances and kiting build :) also i change astral preference for other passive, because your skills arent high ap consumers