Just some advices:
1) if you are new in this biz, don't register names for more than one year in advance. if you see that no one is interested and that you have no traffic during the first year, you can drop it and don't have to pay for 2 years in advance (just one). i see that you paid for 2 years for bitne.com until 2013
2) no need to register the .infos of such brandable names, even if its cheap. - .com is enough. - you registered bitne.info. why? no one will buy that.
3) if you want to specialize on 5L brandable .coms, for beginning its better to focus on names which are not only pronounceable and catchy, but also include a key. by that, i mean try finding cool names with keys like "bid", "buy" , "job" or even 4 letter words. then try to made up a nice 5L out of it. - it is much more difficult as most of them are gone. but now and then, you can find few of them. ordinary CVCVC or VCVCV etc. 5 letter names are hard to sell, unless you have really something catchy and someone really likes it.
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Now some realistic Appraisals:
bitne.com - reg fee
artistscenter.net - reg fee to maybe xx - .com is for sale and no bids
abstractive.org - reg fee, no commercial use
don't want to hurt your feelings, but i think honest realistic appraisals are better for a newbie than anything else. saves you money !
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btw, you could try to sell artistscenter.net to theartistscenter (d0t) c0m.
they have a .com, but with "the" at the start. they may give you few bucks for your .net.
or another option: atlantaartistscenter (d0t) 0rg
another option: artistcenter (d0t) c0m (they have the one with artist , not artists)
anyway, i think it will be hard, as yours is .net and artist(s)