I drive on the original calipers front and rear. I replaced the fluid regularly and recently installed new OE hoses all around. I am thinking I may need to service or replace the calipers or replace the seals on my existing calipers. While eEuroparts has the seals for $30 for each caliper on the fronts and $45 for rebuilt calipers, should I just go with the already rebuilt ones? I was going to replace the rears also. I'm handy at servicing my car and have kept it alive for almost 400K miles. If your suggestion is replacement, which is the best/reasonable units out there?

Thanks for looking.
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'86 sedan with 399,000 miles on the original engine and automatic transmission