Based on the November edition of Insight magazine (for fleet numbers and seating capacity), and personal experience / other posts (for seating arrangements), the business class sections of Tarom's fleet are currently configured as follows:

A310 (x2)
20B + 189Y
No direct info, but I assume this is 'recliner' business class seats

A318 (x4)
14B+99Y, 26B+81Y
This is 3+3 seating, with an adjustable cabin-divider and blocked middle seat in business.
Overhead TV

737-800 (x1)
189BY
According to svajcarac, this is also 3+3 seating (presumably with blocked middle seat in business)

737-700 (x4)
14B+102Y
2+2 'recliner' seats, in a fixed cabin (cupboard and 3 rows on the left-hand side; 4 rows on the right)
Overhead TV

737-300 (x4)
8B + 126Y
2+2 'recliner' seats, in a fixed cabin (2 rows)
No TV/IFE

ATR-72 (x2)
68BY
No information

ATR-42 (x7)
48BY
No information

In my opinion, the 737-700 is the best option (but you probably won't have much choice, as I don't think there are many routes where Tarom operate multiple aircraft types...)