if your trying to truley get the best performance for the least amount of money the you really shouldnt bother with the lower control arms... and since you dont plan on getting heavily into racing you dont need them.
also the speedtech lowers have no performance gain over stock LCA's,the dse lowers are built with aditional + caster but you really dont need them unless you push you car to the limit...
people were probabaly trying to steer you away from qa1 due to the fact that more than less people have had negative reviews on them concerning quality control issues.
why are you set on coil-overs for your mainly street car esp. if your concerned about budget? a conventional coil spring/strut setup will be perfectly fine for you.
best performance for a lower budget for the front end I would sugest
any upper that arent just street rod pieces and are actually geometry corrected like DSE,speedtech,global west,spc just to name a few(brand loyalty

) stock lowers with delrin/del-a-lum bushings,hotckis(just example) coil springs with a bb i would say atleast 600# + ,good shocks ie: koni,bilstien,varishocks,etc(adjustable is better but thier not a MUST)
baer bump steer eliminators,a good 12:1 steering box personally i would go with a lee speq'ed box for ATS or SC&C. and if you can swing it DEFFINATLY get the AFX tall spindles... like mentioned above you can just bolt up corvette c5-c6 brakes right to them and they are a much cheaper option but will be more than enough braking power for you.
hope theres some usefull insite there for ya.