Need phone(s) help

[Kunmui]

ok so iv been going crazy on searching for the right phone(s) to get... and im lookin for some help on what u guys think my best option is... currently i have a razr v3x on tmobile network. i dont use that many mins. avg. of 300ish a month. but heres the thing my plan is up end of Dec. and my gf has cingular i like their coverage cuz she gets network where i dont - not in too many places but she has 1 or 2 more bars pretty much anywhere i go, when im at her house she has network - thru cingular... tmobile dont have any. but heres the thing i want a Black Berry - BB or some type of phone so i can search the web... access my email pretty easy - something like a palm pilot keep track of stuff etc. it seems like tmobile has better price plans for the BB - i was looking into the BB Pearl. but i seen the blackjack - cingular looks pretty nice too. my gf said she would get a family plan with her if i get a BB thru tmobile so i can have a reg. phone plan with cingular. it seems that if i get a BB thru tmobile it will be 19.99 a month and its about 35 bux (each) for a cing. family plan so bout 60 bux a month. vs 39.99 for a individual plan and 34.99 for the BB data plan... so im kinda confused on what phone(s) to get and what plan i should get. ... thanks in advance lol