The HID bulbs are available separately from various outlets, not sure how expensive they are though. (might work out cheaper to just buy another kit, however, they should last a while and some vendors offer warranties)
Your dims will be better with the HID kit versus halogen, but nowhere near as good as they could be unless you address the chrome and lens issues.
When i got my car, the lenses were very yellow - wet sanding with various grits and then final polishing made them look like new - when you have cleaned them, keep them waxed so they look good for longer.
If you want a blue tint to the lights, then go 6000K or maybe 8000K, higher than that tend to look purplish. Remember that the more blue the light, the less output (lumens) on the road and also the more strain on the eyes.
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Oh okay.. so maybe just going with 8000k looks bright enough.. but i don't want to sacrifice vision.. so maybe i'll stick with 6k... Okay.. I sure will... because from the look of the inside.. thier chrome is fine.. but then agian.. its so yellow... i can't tell.. mine are also getting moister in them... so i guess the seal is already broken... I guess my best bet would be to tear them open... so if nothing else... just to reseal them really well.. how is the goop holding up? Is there anything stronger with a stronger hold I can get... someone told me High temp RTV silicone.