yep. all the research i've seen says Creatine Monohydrate is about the best. Creatine Ethyl Ester is also proven, and for peeps who get side effects from creatine mono (which don't get resolved by increasing water consumption a little) might wanna try Ethyl Ester. Its not that much more expensive.
500g of Mono should only run $15 in the US. that's 100 servings: 3 months worth. $60 a year.
Something like NO Xplode, which is creatine and a bunch of other crap like caffine, taurine, a little sugar, and NO2 supps.. will run you $50 for only 45 days supply.
And the extra crap is pointless (NO2) or over priced (if you want caffine drink a cup of black coffee).
Creatine Citrate, Malate and Gluconate have all been shown to have poorer absorption that Mono. or Ethyl Ester.
I'd go with Optimum Nutrition or AtLargeNutrition.com for creatine Monohydrate. Both use creapure processed creatine which is regarded as the best manufacturing process for purity.