I would go with the ackie. They are small, outgoing, fun to watch and generally very friendly. Mine never attempt to run or hide no matter what you do in the cage, they just check it out. The yellows are less expensive, usually starting about $150. The reds usually start around $250. Of course you can find all kinds of prices in between. For the most part, the larger, well established breeders may have higher prices, but you are also paying for years of selective breeding to produce the best quality animals for their customers, and that is certainly worth the price. The choice is yours to make, just buy from a reputable person. Good luck, I'm sure you will be very happy with an ackie. When you are older and have more money, if you like the monitors, you can think about a kimberly.
Pam 

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1.1 varanus acanthurus brachyurus (Dorado & Dora)
1.1 u. macfadyeni (Amani & Abeba)
1.2 u. ornata (Husani, Zari, & Bintu)
0.0.1 geochelone carbonaria (Rojo)
0.0.1 cyclura hybrid lewisi x caymanensis x nubila (No Name)
1.1 hyla chrysoscelis (Pudge & Squirt)
