Your alignment should be okay after installing the new shocks, but it couldn't hurt to have it done. As long as the mechanic doesn't move any of the tierods in the front or bend something, then I don't see why it wouldn't just go back to its previous position. Again, if you can afford to do shocks all around, go for it. You'll definitely notice an improvement (much greater than replacing both control arms)!
Check your other control arm's ball joints for play. If there is any, then that is reason enough to replace it. I understand not being able to afford the other control arm right now. In the US we have the luxury of relatively cheap parts. I'm not sure of the situation in Estonia, but I would imagine they are a bit more expensive.
Last edited by WDE46; 01-23-2013 at 07:45 AM.