SQL & PL/SQL :: Selection Based On Date Range

Problem:

Our term (strm) is dictated by the term_begin_dt and term_end_dt dates but I want to keep selecting that term until 1 week before the next term opens and then switch to that term.

Basically, I don't want any gaps between a term.

Output:

select strm when sysdate is between term_begin_dt and term_end_dt (strm would equal 3943)
select strm until 1 week before the start of the next term (4027) (strm would equal 3943)
select strm when 1 week before term_begin_dt (strm would equal 4027)

Repeat for the next term and so on 12/16/2011
select strm
from term
where trunc(sysdate) between trunc(term_begin_dt) and trunc(term_end_dt)

Output: 3943
12/17/2011 - 01/01/2012

select strm
from term
where ?

Output: 3943

01/02/2012 - 5/4/2012
select strm
from term
where ?

Output: 4027

Repeat.

Test Case:

CREATE TABLE TERM
(
STRM VARCHAR2(4 BYTE),
DESCR VARCHAR2(20 BYTE),
TERM_BEGIN_DT DATE,
TERM_END_DT DATE
)

Insert into TERM
(STRM, DESCR, TERM_BEGIN_DT, TERM_END_DT)
Values
('3943', '2011 Fall Semester', TO_DATE('08/22/2011 00:00:00', 'MM/DD/YYYY HH24:MI:SS'),
TO_DATE('12/16/2011 00:00:00', 'MM/DD/YYYY HH24:MI:SS'));
Insert into TERM
[code].....