CP or Not CP. That is the Question.

Building back up my deck in Splinterlands has been where my rewards from my posts have gone in recent months. As soon as my rewards come through I turn my HBD into liquid Hive and I convert to DEC and buy a Splinterlands card. I have accumulated up to 60,000 CP with these rewards and I have built a pretty solid level 3/4 deck that can compete in tournaments and brawls (thanks @niallon11). Overall I have 252 cards right now which is a long way from November when @penderis loaned me a few for nothing to get me going god bless him.
My rating is well above my level mainly due to the CP limits so I am renting at the end of a season to promote myself into gold for better rewards meanwhile building to get to that gold level.
Now I could easily hit the CP if I max out some of the 1 cent common cards but instead I am investing in cards that help me improve my deck rather than focusing on CP. Maybe I will regret this in the long term when these cards are inexpensive but I like playing the game so investing in a card I would use alot is much more beneficial to a card with a higher CP. I listen to Dwayne Cunningham's or @infidel1258 on Youtube every day and I find some of the tips coming from his videos very helpful. The game is quite complicated when you get into the nitty gritty so these Youtube videos are great for newcomers and I recommend people watch them.
I actually have one question that I would like to ask the community around CP. I am wondering if someone did the maths. Is it better to max out a few regular common card with 400 BCX that are 1 cent at the moment or save up and buy a gold legendary. I would say there is pro's and cons. Is there a tool to find the cheapest CP for example if this is what you would like to do. I might start investing some external crypto into CP rather than my deck soon and would like to know the best way to just increase the CP. I know there is a tool when renting , renting for a certain CP for the lower cost but buying the highest CP for the minimum price is something I would be interested in so I can compete at the higher levels if I so wish.
So apart from the battle in Splinterlands I am facing a dilemma over what i should be doing. Buying cheap CP or buying and upgrading my cards so I don't get battered. It's all well and good having the CP but if you do not have a solid deck I will be eaten alive especially in brawls. There is always opportunity cost in Splinterlands so I am siding with the building my deck at the moment but give it a year and I think the two will balance out and CP will no longer be an issue.