Hey welcome to the forum! I think the LinkExchangeAds.com has good value, as for link exchanges are becoming very popular. low xxx. The other one I dont see much value in, i'd develope it.
Hope that helps!
For domain appraisal you can use Domain Appraisal Service in XnYnZ.com .It is a free service and you can enter upto 20 domains and find the approximate value.I checked for the price of the domain names that you have specified using that service and found that the approximate range
links2finance.com $8.00 - $32.00
linkexchangeads.com $194.00 - $582.00