O inom produkte pre Windows neviem. Ale jednoznačne Delphi je najlepšie riešenie pre vývoj v Object pascale a tvoj problém je, že staršie verzie Delphi nepodporujú vývoj pre 64-bitové stroje.
http://en.wikipedia.org/wiki/Embarcadero_Delphi
Wikipedia píše:
No native 64-bit support
Delphi creates 32-bit native applications only; it is not possible to write 64-bit native Windows applications. 32-bit Windows applications cannot use more than 4 GB of memory. Delphi cannot be used to write plug-ins for 64-bit third party applications and services, such as Windows Explorer. Delphi support for 64-bit applications has been planned for some years, but has been postponed several times. The x64 compiler preview (command-line only) is planned for the first half of 2011. According to the May 2010 roadmap a native x64 RTL/VCL/Cross-platform environment is due later (no date announced).
Ak tomu dobre rozumiem, podpora pre 64-bit je až od verzie Delphi 2011 (Delphi XE), ale ako koľko stojí táto verzia netuším.