What should I get?

hi everyone!
i've got mbp 13 (mid 2010), understood need more.
ve got variants:
1. imac 27', , use mbp 13 on go desecion
2. mbp 17' , keep mbp 13 on go desecion
3. sell mbp 13 , , mbp 15 in 1 system
4. keep mbp 13 , air 11'6
of advice?
i'm student, don't need take mbp me, mobility of mbp important.
prices in russia mac lit bit bigger:
mbp 15 - 2000$
imac 27 - 2000$
mbp 17 - 2300$
air 11.6 - 1150$
thank in advance!
or should wait mbp summer lineup?

 

what computational needs? important question , answer, leads correct decision.

 

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