in terms of alignment and balancing, there can be few things which cause steering wheel to vibrate or wobble.
if steeering wheel vibrates at speed between 80-120km/h - defenitely balancing problem. if possible balance the wheels on the inner side and outer side for almost perfect balancing job.
if more than 120km/h vibration normally can be caused by uneven surface tyres, of even tyre pressures. normally fixed by doing on-wheel balancing.
if at low speed normally its wobbling...check tyre wear. if very thin, recommended to change new or swap with rear tyres if still good condition. check rims for bents or disalign. jack up car and roll tyres with ur hand to see whether its still round or out of shape.
steering vibrations at speed can also be caused by faulty steering tie rod/ tie-rod end. remove tyres and shake the tierod, if got movements, time for a new set.
if the new lower arms were not tightened properly can also caused similar vibration effect. be careful! other that this is worn out wheel bearings (normally got sound; increasing with speed) and also worn out knuckle arm (where the bearing sits). it happened to me in 2002.
good luck to you...wish u cheaply repairs..