To your question; I personally purchase the 125 pk TCredits S/O. I use it to maintain my EA position and when I have extra funds I still purchase more TCredits. You can also purchase the PK of 30 Gift Cards S/O also as this gives your prospective PSA and TClicks members a look at the TripleClicks products which are available for purchase; then if you don't get a PSA you still have the opportunity of getting a TClicks Member plus you also get 10VP from each card.
However; my favorite is the 125 pk TCredits S/O I get 1500VSP plus 100VAP, I can visit the auction for each bet I get 1VAP plus 5 MRP some time 10 per bid if it's double, you got TCredits to bid where you can win more TCredits pk or 3-6 months subscriptions which carry 4500-9000 VSP, sometime for as little as $1.50, or other products like 30 Gift Cards pk, Iphone all these help to build your business. The AVP build your action points, the SVP build your sales points, the MRP you can use to buy more TCredits or buy items in the TClicks shop.
So to summarise buying the 125 pk S/O TCredits is a win, win purchase for me.
To your question; I personally purchase the 125 pk TCredits S/O. I use it to maintain my EA position and when I have extra funds I still purchase more TCredits. You can also purchase the PK of 30 Gift Cards S/O also as this gives your prospective PSA and TClicks members a look at the TripleClicks products which are available for purchase; then if you don't get a PSA you still have the opportunity of getting a TClicks Member plus you also get 10VP from each card.