First find out whats your issue. Do you work on your own car? Whats your budget?
If you dont work on your car and your budget is $3000 and less keep the 7m..... $5000+ go with a JZ series.
Personally whenever my 7m dies I will be going 2JZGE-T from my pricing its going to cost me around 2000+/- that includes buying the motor, 2mm MHG, rebuilding it and random parts to get it running b/c I will re-use some of my 7m parts like my IC pipes, IC, exhaust, boost controller, SAFC II, all my guages, injectors etc.